Semiconductor quantum dots (QDs) are light-emitting contaminants around the nanometer scale that have emerged as a new class of fluorescent labels for chemical analysis, molecular imaging, and biomedical diagnostics. character of cadmium-containing QDs is certainly no one factor for in vitro diagnostics much longer, so the usage of multicolor QDs for molecular diagnostics and pathology is just about the most significant and medically relevant program for semiconductor QDs in the instant future. is certainly magnified in 78755-81-4 manufacture … Presently, a significant challenge is to provide freely monodispersed and diffusing QD probes in to the cytoplasm of living cells. One effective technique is to inject QDs into living 78755-81-4 manufacture cells with a microneedle directly. However, this technique is quite low throughput as the specific cells should be injected individually (70). To attain higher-throughput delivery of QDs to cell populations, researchers have attemptedto briefly ...

The tunable fluorescent nanoparticles known as quantum dots make ideal tools for distinguishing and identifying rare cancer cells in tissue biopsies, Emory and Georgia Tech scientists have demonstrated.. An article to be featured on the cover of the July 15 issue of Analytical Chemistry describes how multicolor quantum dots linked to antibodies can distinguish the Reed-Sternberg cells that are characteristic of Hodgkins lymphoma.. Our multicolor quantum dot staining method provides rapid detection and identification of rare malignant cells from heterogenous tissue specimens, says senior author Shuming Nie, PhD, the Wallace H. Coulter distinguished professor in the Coulter department of biomedical engineering at Georgia Tech and Emory University. The clinical utility is not limited to Hodgkins lymphoma but potentially could be extended to detect cancer stem cells, tumor-associated macrophages and other rare cell types.. Quantum dots are nanometer-sized semiconductor crystals that have ...

Water soluble positively charged 2-(dimethylamino) ethanethiol (DAET)-protected core-shell CdSe/ZnS quantum dots (QDs) were synthesized and incorporated within negatively charged Nafion polymer films. The water soluble QDs were characterized using UV-visible and fluorescence spectroscopies. Nafion/QDs composite films were deposited on glassy carbon electrodes and characterized using cyclic voltammetry. The electrochemiluminescence (ECL) using hydrogen peroxide as co-reactant was enhanced for Nafion/QDs composite films compared to films of the bare QDs. Significantly, no ECL was observed for Nafion/QDs composite films when peroxydisulfate was used as the co-reactant, suggesting that the permselective properties of the Nafion effectively exclude the co-reactant. The ECL quenching by glutathione depends linearly on its concentration when hydrogen peroxide is used as the co-reactant, opening up the possibility to use Nafion/QDs composite films for various electroanalytical applications.. ...

The CdSe quantum dots (QDs) with bidentate ligands: a-diimine (NN) and dihydrolipoic acid (DHLA) were synthesized and characterized by UV-Vis, particle size and capillary electrophoretic techniques. Two systems were analyzed: CdSe with one ligand (CdSe/ligand) and CdSe with two different ligands (CdSe//ligand1/ligand2), where ligand = α-diimine or DHLA. Hydrodynamic features of functionalized QDs were characterized by zone capillary electrophoretic (CZE), and particle size techniques and these methods were consistent. It was established that CZE, micellar (MEKC) and microemulsion (MEEKC) modes were suitable for separating charged CdSe QDs and that no peaks were obtained for QDs passivated with electrically neutral ligands. For CdSe QDs with neutral (NN) ligands, a preconcentration method with the use of a micellar plug was introduced for visualizing these QDs. A sharp peak representing neutral QDs was obtained within the zone of micellar plug of a non-ionic surfactant, Here, a ligand character ...

Researchers achieved a milestone in exploring biology using nanotechnology utilizing single-particle tracking to investigate the interaction between human T cells and individual fluorescent nanoparticles of semiconductor quantum dots (QDs). The researchers were able to deliver QDs into the cytosol of live T cells by decorating the nanoparticles with a unique cell-penetrating peptide. The study paves the way for improving drug delivery and immunotherapy using novel nanocarriers.

We experimentally demonstrated plasmon-asssisted energy transfer (ET) between CdSe semiconductor quantum dots (QDs) self-assembled in a monolayer by using time-resolved μ-photoluminescence (PL) technique. The enhancements of PL intensity and ET efficiency were manipulated by adjusting thickness (Δ) of SiO2 coating on large Ag nanoparticles. The PL enhancement factor of the acceptor QDs and the PL intensity ratio of acceptor-to-donor reached their maxima ~ 47 and ~ 14 when Δ = 7 nm, the corresponding ET efficiency reached 86%. We also presented theoretical analysis based on the rate equation. The theoretical calculations agreed with experimental data and revealed interesting physics of multipole effect, and metal nanoparticle induced quench effect and plasmon-enhanced Förster ET.. ©2010 Optical Society of America. Full Article , PDF Article ...

In carrier multiplication, the absorption of a single photon results in two or more electron-hole pairs. Quantum dots are promising materials for implementing carrier multiplication principles in real-life technologies. So far, however, most of research in this area has focused on optical studies of solution samples with yet to be proven relevance to practical devices. We report ultra-fast electro-optical studies of device-grade films of electronically coupled quantum dots that allow us to observe multiplication directly in the photocurrent. Our studies help rationalize previous results from both optical spectroscopy and steady-state photocurrent measurements and also provide new insights into effects of electric field and ligand treatments on multiexciton yields. Importantly, we demonstrate that using appropriate chemical treatments of the films, extra charges produced by carrier multiplication can be extracted from the quantum dots before they are lost to Auger recombination and hence can ...

TY - JOUR. T1 - Hybrid semiconducting polymer dot-quantum dot with narrow-band emission, near-infrared fluorescence, and high brightness. AU - Chan, Yang-Hsiang. AU - Ye, Fangmao. AU - Gallina, Maria Elena. AU - Zhang, Xuanjun. AU - Jin, Yuhui. AU - Wu, I. Che. AU - Chiu, Daniel T.. PY - 2012/5/2. Y1 - 2012/5/2. N2 - This communication describes a new class of semiconducting polymer nanoparticle-quantum dot hybrid with high brightness, narrow emission, near-IR fluorescence, and excellent cellular targeting capability. Using this approach, we circumvented the current difficulty with obtaining narrow-band-emitting and near-IR-fluorescing semiconducting polymer nanoparticles while combining the advantages of both semiconducting polymer nanoparticles and quantum dots. We further demonstrated the use of this new class of hybrid nanomaterial for effective and specific cellular and subcellular labeling without any noticeable nonspecific binding. This hybrid nanomaterial is anticipated to find use in a ...

Semiconductor quantum dots have many advantages compared to the other candidates for optically accessible qubits. For example, majority of the photons are emitted into the zero phonon line making them bright, narrow bandwidth single-photon sources. Also fast spin manipulation of the spin states (~4ps) is possible, and the spontaneous emission time is short (~600ps), making a repetition rate of 76MHz possible in our experiment. There are, however, also drawbacks: the dephasing time of the spin states is about 1ns, limiting the useful time window in the entanglement generation. Moreover, lack of a cycling transition, reduces the likelihood of being able to determine the spin state at a single experimental run, limiting efficient scaling to more spins. Luckily these drawbacks can be overcome by using coupled quantum dot systems that have much richer transition structure and the spin qubits can be more robust against the noisy environment [10]. We aim to achieve spin-spin entanglement in the coupled ...

A semiconductor light emitting/detecting device has a first doped silicon layer, an intrinsic silicon epitaxial layer formed on the first doped silicon layer, at least one quantum dot embedded within the intrinsic silicon epitaxial layer, and a second doped silicon layer formed on the second intrinsic silicon epitaxial layer.

article{c289d129-c9be-4bc8-99e4-14cd9c29c08d, abstract = {We demonstrate transport spectroscopy on bottom-up grown few-electron quantum dots in semiconductor nanowires. The dots are defined by InP double barrier heterostructures in InAs nanowires catalytically grown from nanoparticles. By changing the dot size, we can design devices ranging from single-electron transistors to few-electron quantum dots. In the latter case, electrons can be added one by one to the dots from 0 to similar to50 electrons while maintaining an almost constant charging energy, with addition spectra of the devices displaying shell structures as a result of spin and orbital degeneracies. The reduced dimensionality of the nanowire emitter gives rise to pronounced resonant tunneling peaks, where a gate can be used to control the peak positions.}, author = {Björk, Mikael and Thelander, Claes and Hansen, Adam and Jensen, Linus E and Larsson, Magnus and Wallenberg, Reine and Samuelson, Lars}, issn = {1530-6992}, language = ...

... Modern telecommunications happens because of fast electrons and ... PLASMONICS ...When light strikes a strip of metal an electron wave can be excited in... Heres where the JQI experiment comes in. The main result of the wor...,Using,single,quantum,dots,to,probe,nanowires,biological,advanced biology technology,biology laboratory technology,biology device technology,latest biology technology

TY - JOUR. T1 - Feasibility of a point-of-care test based on quantum dots with a mobile phone reader for detection of antibody responses. AU - Cysticercosis Working Group in Peru. AU - Lee, Chan. AU - Noh, John. AU - ONeal, Seth E.. AU - Gonzalez, Armando E.. AU - Garcia, Hector H.. AU - Handali, Sukwan. PY - 2019/10/1. Y1 - 2019/10/1. N2 - We developed a novel and portable fluorescent sensor that integrates a lateral flow assay with a quantum dot (Qdots) label and a mobile phone reader for detection of specific antibodies in human serum. We evaluated the utility of this assay to test for antibodies to the Taenia solium rT24H antigen. It was a retrospective study by examining 112 positive human sera from patients with neurocysticercosis (NCC) including samples from patients with single viable cyst (n = 18), two or more viable cysts (n = 71), and subarachnoid (racemose) cysts (n = 23). These samples were collected from previous study subjects in Lima, Peru under an approved study protocol in ...

A transistor device is provided that includes a gate electrode disposed between source and drain electrodes and overlying a quantum dot structure realized by a modulation doped quantum well structure. A potential barrier surrounds the quantum dot structure. The transistor device can be configured for operation as a single electron transistor by means for biasing the gate and source electrodes to allow for tunneling of a single electron from the source electrode through the potential barrier surrounding the quantum dot structure and into the quantum dot structure, and means for biasing the gate and drain electrodes to allow for selective tunneling of a single electron from the quantum dot structure through the potential barrier surrounding the quantum dot structure to the drain electrode, wherein the selective tunneling of the single electron is based upon spin state of the single electron.

Quantum dots (QDs) and silica nanoparticles (SNs) are new classes of fluorescent probes that overcome the limitations encountered by organic fluorophores in bioassay and biological imaging applications. We encapsulated QDs and SNs into liposomes by the reverse-phase evaporation method. Nanoparticle-loaded liposomes were separated from unencapsulated nanoparticles by size exclusion chromatography and their characteristics were investigated. Dual-color, two-photon fluorescence correlation spectroscopy was used to measure the number of nanoparticles inside each liposome. Results indicated that nanoparticle-loaded liposomes were formed and separated from unencapsulated nanoparticles by using Sepharose gel. As expected, fluorescence self-quenching of nanoparticles inside liposomes was not observed. When a 0.8 mM solution of 50 nm QDs was used for liposome preparation, each liposome encapsulated an average of three QDs. However, we could not measure the number of SNs inside each liposome due to the spectral

TY - JOUR. T1 - Oral administration of hydroxylated-graphene quantum dots induces intestinal injury accompanying the loss of intestinal stem cells and proliferative progenitor cells. AU - Yu, Lan. AU - Tian, Xin. AU - Gao, Dexuan. AU - Lang, Yue. AU - Zhang, Xiang Xiang. AU - Yang, Chen. AU - Gu, Meng Meng. AU - Shi, Jianming. AU - Zhou, Ping Kun. AU - Shang, Zeng Fu. N1 - Funding Information: This study was supported by the National Natural Science Foundation of China (81530085, 81472919, 81872546), Natural Science Foundation of Jiangsu Province (BK20181180), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection. The authors thank all the research staff and students who took part in this work. Publisher Copyright: © 2019, © 2019 Soochow University.. PY - 2019/11/26. Y1 - 2019/11/26. N2 - Graphene quantum dots (GQDs) have gained significant attention in various biomedical ...

Page contains details about indium tin oxide/magnesium zinc oxide/tetrabutylammonium-treated lead sulfide quantum dots/1,2-ethanedithiol-treated lead sulfide quantum dots solar cell . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com

TY - GEN. T1 - The Luminescent Down Shifting Effect of Single-Junction GaAs Solar Cell with Perovskite Quantum Dots. AU - Cho, Yu Yun. AU - Huang, Yu Ming. AU - Hsu, Shun Chieh. AU - Kao, Sheng Feng. AU - Shih, Hsiang Yun. AU - Lee, Ting Yu. AU - Liu, Yin Hsin. AU - Chen, Teng Ming. AU - Kuo, Hao Chung. AU - Lin, Chien Chung. PY - 2019/6. Y1 - 2019/6. N2 - In this work, we demonstrate the Luminescent Down Shifting (LDS) effect of the single-junction GaAs solar cell with 514 nm Perovskite quantum dots with and without bake treatment. One of results shows that Jsc from 22.22 mA/cm2 to 23.38 mA/cm2 and the efficiency from 17.70% to 18.96% as high as 5.22% and 7.12% enhancement. The enhancement includes antireflection and LDS effect, via our calculated the increase Jsc from LDS effect was 31.65%. Further storage lifetime test shows great reliability from these devices can be expected.. AB - In this work, we demonstrate the Luminescent Down Shifting (LDS) effect of the single-junction GaAs solar cell ...

Abstract: Quantum computers have the potential to efficiently solve problems in logistics, drug and material design, finance, and cybersecurity. However, millions of qubits will be necessary for correcting inevitable errors in quantum operations. In this scenario, electron spins in gate-defined silicon quantum dots are strong contenders for encoding qubits, leveraging the microelectronics industry know-how for fabricating densely populated chips with nanoscale electrodes. The sophisticated material combinations used in commercially manufactured transistors, however, will have a very different impact on the fragile qubits. We review here some key properties of the materials that have a direct impact on qubit performance and variability ...

Hydrogen sulfide (H2S) is protective in myocardial ischemia/reperfusion injury (I/R). However, venous injection of NaHS and local injection of adenovirus with cystathionine-γ-lyase (CSE) plasmids was used to increase H2S concentration presented low-efficiency and side-eff...

The increasing use of products derived from nanotechnology has raised concern about their potential toxicity to aquatic life. This study sought to examine the comparative immunotoxicity of capped cadmium sulphide/cadmium telluride (CdS/CdTe) quantum dots (QDs) and possible impact of particle/aggregate size on two bivalves (Mytilus edulis and Elliptio complanata) and a fish (Oncorhynchus mykiss). The QDs were dispersed in sterile water and fractionated using a series of micro/ultrafiltration membranes of decreasing pore size: 450 nm, 100 nm, 50 nm, 25 nm, 100 kDa (6.8 nm), 30 kDa (4.6 nm), 10 kDa (3.2 nm) and 1 kDa (1.5 nm). The total concentrations of cadmium and tellurium were determined for the filtered material and for that retained on the filters (retentate). The immunotoxicity was determined by measuring cell viability and phagocytosis. Results revealed that nanoparticles retained on the ultrafilters had a higher Cd/Te ratio compared to the permeate fraction (ratio of 5 and 2 respectively) ...

Mid-infrared wavelength range (3 μm to 30 μm) is important in many applications such as environmental monitoring, industrial process control, bio- medical imaging, security and defense. The mid-IR is the spectral home of the distinct vibrational and rotational absorption resonance signatures of a wide range of molecular species, giving mid-IR sensing systems the potential to enable the monitoring and identification of molecules for gas sensing or chemical and biological imaging applications. To enable many of the above applications, compact, high efficiency, and low-cost mid-IR emitters and detectors are required. The goal of this project is to develop highly efficient and low-cost mid-IR emitters. The first part of this thesis gives an introduction to why mid-IR light is important and the state-of-the-art mid-IR sources. We discuss the working theory, structure, advantages and disadvantages of quantum cascade laser (QCL), interband cascade laser and type-I quantum well lasers, which together ...

The enhanced efficiency of the crystalline silicon (c-Si) solar cell with nanopillar arrays (NPAs) was demonstrated by deployment of CdS quantum dots (QDs). The NPAs was fabricated by the colloidal lithography and reactive-ion etching techniques. Under a simulated one-sun condition, the device with CdS QDs shows a 33% improvement of power conversion efficiency, compared with the one without QDs. For further investigation, the excitation spectrum of photoluminescence (PL), absorbance spectrum, current-voltage (I-V) characteristics, reflectance and external quantum efficiency of the device was measured and analyzed. It is noteworthy that the enhancement of efficiency could be attributed to the photon down-conversion, the antireflection, and the improved electrical property.. ©2011 Optical Society of America. Full Article , PDF Article ...

Besides microcavities and photonic crystals, photonic nanowires have recently emerged as a novel resource for solidstate quantum optics. We will review recent studies which demonstrate an excellent control over the spontaneous emission of InAs quantum dots (QDs) embedded in single-mode GaAs photonic wires. On the basic side, we have demonstrated a strong inhibition (x 1/16) of QD SpE in thin wires (d0.95 for d~λ/n), and polarization control in elliptical nanowires. A single QD in a photonic wire is thus an attractive system to explore the physics of the one-dimensional atom and build novel quantum optoelectronic devices. Quite amazingly, this approach has for instance permitted (unlike microcavity-based approaches) to combine for the first time a record-high efficiency (72%) and a negligible g(2) in a QD single photon source ...

Susumu, K, Oh, E, Delehanty, JB, Blanco-Canosa, JB, Johnson, BJ, Jain, V, Hervey, WJudson, W. Algar, R, Boeneman, K, Dawson, PE, Medintz, ...

The idea depends on prepared quantum dots semiconductor nanoparticles of a highly stable cesium-lead halide perovskite, as well as a composite material made of these quantum dots and graphene oxide. Both materials showed an efficient absorption of visible light and strong luminescence. The leader of team Dai-Bin Kuang and colleagues used these products to achieve a fundamental step in artificial photosynthesis the reduction of CO2. To simulate sunlight, they used a xenon lamp with an appropriate filter.. Perovskite quantum dot photocatalysts surpassed the efficiency of cadmium sulfide and other state-of-the-art materials in the conversion of CO2 to carbon monoxide and methane. Chemists also demonstrated the synergetic effect of the composite - when combined with graphene oxide, perovskite Quantum Dots (QDs) achieved photocatalytic performances 26% higher than QDs alone. According to researchers, graphene oxide boosts the efficiency of the QDs improving the charge separation and transportation. ...

Spin qubits created from gate-defined silicon metal-oxide-semiconductor quantum dots are a promising architecture for quantum computation. The high single qubit fidelities possible in these systems, combined with quantum error correcting codes, could potentially offer a route to fault-tolerant quantum computing. To achieve fault tolerance, however, gate error rates must be reduced to below a certain threshold and, in general, correlated errors must be removed. Here we show that pulse engineering techniques can be used to reduce the average Clifford gate error rates for silicon quantum dot spin qubits down to 0.043%. This represents a factor of three improvement over state-of-the-art silicon quantum dot devices and extends the randomized benchmarking coherence time to 9.4 ms. By including tomographically complete measurements in our randomized benchmarking, we infer a higher-order feature of the noise called the unitarity, which measures the coherence of noise. This, in turn, allows us to theoretically

To realize quantum information processing schemes in semiconductor systems, the coherent transport of spin carriers is of significant importance. Recent work using the unique system of dynamic quantum dots (DQDs) shows that small ensembles of electron spins can be transported over long distances and manipulated while retaining their microscopic confinement. The DQDs are produced by the superposition of piezoelectric potentials from surface acoustic wave beams propagating along orthogonal directions on a GaAs/(Al,Ga)As (001) quantum well sample. While it is clear that the confinement potential of the DQDs reduces Dyakonov-Perel spin dephasing during transport, the effects of the strain and magnetic fields on spin dephasing are much more complicated. We will discuss the underlying mechanisms behind the ability to transport spins over long distances including the impact of confinement on spin coherence. In addition, the strong dephasing of the spin coherence in an external magnetic field will be ...

Potential routes of nanomaterial exposure include inhalation, dermal contact, and ingestion. Toxicology of inhalation of ultra-fine particles has been extensively studied; however, risks of nanomaterial exposure via ingestion are currently almost unknown. Using enterocyte-like Caco-2 cells as a small intestine epithelial model, the possible toxicity of CdSe quantum dot (QD) exposure via ingestion was investigated. Effect of simulated gastric fluid treatment on CdSe QD cytotoxicity was also studied. Commercially available CdSe QDs, which have a ZnS shell and poly-ethylene glycol (PEG) coating, and in-house prepared surfactant coated CdSe QDs were dosed to Caco-2 cells. Cell viability and attachment were studied after 24 hours of incubation. It was found that cytotoxicity of CdSe QDs was modulated by surface coating, as PEG coated CdSe QDs had less of an effect on Caco-2 cell viability and attachment. Acid treatment increased the toxicity of PEG coated QDs, most likely due to damage or removal of the

In order to detect low level glucose concentration, an electrochemiluminescence (ECL) biosensor based on TGA-capped CdSe quantum dots (QDs) was fabricated by the immobilization of CdSe QDs after modifying the surface of a glassy carbon electrode (GCE) with 4-aminothiophenol diazonium salts by the electrochemical method. For the detection of glucose concentration,|i| glucose oxidase|/i| (GOD) was immobilized onto the fabricated CdSe QDs-modified electrode. The fabricated ECL biosensor based on TGA-capped CdSe QDs was characterized using a scanning electron microscope (SEM), UV-vis spectrophotometry, transmission electron microscopy (TEM), a fluorescence spectrometer (PL), and cyclic voltammetry (CV). The fabricated ECL biosensor based on TGA-capped CdSe QDs is suitable for the detection of glucose concentrations in real human blood samples.

Stable luminescence, size-tunability, and biocompatibility encourage the deployment of Cd-free NPs into diverse biological applications. Here we report one-pot synthesis of blue-emitting and polymerizable silicon quantum dots (Si QDs) from which water-soluble Si QDs embedded polystyrene nanoparticles (SiQD@PS NPs) were prepared using a miniemulsion polymerization approach. The hydrodynamic size of NPs was controlled by KOH to oleic acid molar ratio. Studies on the photoluminescence properties of SiQD@PS NPs in different conditions reveal that they exhibit two-photon luminescence property and high stability against pH and UV exposure. These NPs add new size regime to the Si QDs based luminescent makers for bioimaging and therapy applications.

Conventional nanofabrication strategies must be augmented by new techniques including self assembly methods in order to truly take advantage of the quantum nature of novel nanoscale devices and systems and permit the use of these properties for real applications in a larger system (> 10 nm and < 1 micron). In this talk, I will describe a novel technique for the fabrication of nano-assemblies of carbon nanotubes (CNT) and quantum dots (QD) -formation of CNT-QD conjugates-. CNTs are primarily functionalized with carboxylic end groups by oxidation in concentrated sulfuric acid. Thiol stabilized QDs in aqueous solution with amino end groups were conjugated to carbon nanotubes using the ethylene carbodiimide coupling reaction. Next, I will discuss the possibilities of using carbon nanotubes for encapsulation and mass transport and present our first observations in this area. Fourier transform infrared spectroscopy data for the chemical modification of carbon nanotubes and scanning and transmission

The exact optical response of quantum few-level systems depends crucially on the exact choice of the incoming pulse areas. We use four-wave mixing (FWM) spectroscopy to infer the coherent response and dynamics of single InAs quantum dots (QDs) and study their pulse area dependence. By combining atomic force microscopy with FWM hyperspectral imaging, we show that the retrieved FWM signals originate from individual QDs enclosed in natural photonic defects. The optimized light-matter coupling in these defects allows us to perform our studies in a wide range of driving field amplitudes. When varying the pulse areas of the exciting laser pulses Rabi rotations of microscopic interband coherences can be resolved by the two-pulse FWM technique. We investigate these Rabi coherence rotations within two- and three-level systems, both theoretically and experimentally, and explain their damping by the coupling to acoustic phonons. To highlight the importance of the pulse area in uence, we show that the ...

Nanostructuring organic polymers and organic/inorganic hybrid materials and controlling blend morphologies at the molecular level are the prerequisites for modern electronic devices including biological sensors, light emitting diodes, memory devices and solar cells. To achieve all-around high performance, multiple organic and inorganic entities, each designed for specific functions, are commonly incorporated into a single device. Accurate arrangement of these components is a crucial goal in order to achieve the overall synergistic effects. We describe here a facile methodology of nanostructuring conjugated polymers and inorganic quantum dots into well-ordered core/shell composite nanofibers through cooperation of several orthogonal non-covalent interactions including conjugated polymer crystallization, block copolymer self-assembly and coordination interactions. Our methods provide precise control on the spatial arrangements among the various building blocks that are otherwise incompatible with one

In quantum computing, a quantum algorithm is an algorithm which runs on a realistic model of quantum computation, the most commonly used model being the quantum circuit model of computation.[1][2] A classical (or non-quantum) algorithm is a finite sequence of instructions, or a step-by-step procedure for solving a problem, where each step or instruction can be performed on a classical computer. Similarly, a quantum algorithm is a step-by-step procedure, where each of the steps can be performed on a quantum computer. Although all classical algorithms can also be performed on a quantum computer,[3]:126 the term quantum algorithm is usually used for those algorithms which seem inherently quantum, or use some essential feature of quantum computation such as quantum superposition or quantum entanglement. Problems which are undecidable using classical computers remain undecidable using quantum computers.[4]:127 What makes quantum algorithms interesting is that they might be able to solve some problems ...

The electronic energies of Lead Salt Quantum Dot Ionic Liquids are determined primarily by quantum confinement due to their large exciton Bohr radii.

Surface-enhanced Raman scattering (SERS)-based cancer diagnostics is an important analytical tool in early detection of cancer. Current work in SERS focuses on plasmonic nanomaterials that suffer from coagulation, selectivity, and adverse biocompatibility when used in vitro, limiting this research to stand-alone biomolecule sensing. Here we introduce a label-free, biocompatible, ZnO-based, 3D semiconductor quantum probe as a pathway for in vitro diagnosis of cancer. By reducing size of the probes to quantum scale, we observed a unique phenomenon of exponential increase in the SERS enhancement up to ~106 at nanomolar concentration. The quantum probes are decorated on a nano-dendrite platform functionalized for cell adhesion, proliferation, and label-free application. The quantum probes demonstrate discrimination of cancerous and non-cancerous cells along with biomolecular sensing of DNA, RNA, proteins and lipids in vitro. The limit of detection is up to a single-cell-level detection. Surface enhanced

We propose to develop a high-efficiency, triple-junction, epitaxial lift-off (ELO) solar cell by incorporating quantum dots (QDs) within the current-limiting subcell. We intend to leverage existing QD epitaxy processes developed by the Rochester Institute of Technology and combine this with MicroLinks expertise in multi-junction cell growth and ELO technology. We will employ QDs to enhance the middle cell absorption in a InGaP/GaAs/InGaAs metamorphic IMM cell. Detailed balance calculations indicate that the triple junction efficiency can be increased to ~42% by reducing the bandgap of the middle cell to ~1.2 eV. The combination of the QD technology with multi-junction ELO technology will be exploited in two ways: i) ELO GaAs cells with QD can be grown into full triple-junction cells and ii) back-surface reflectors on the ELO cells will be used to improve absorption by routing IR light for a second pass through the QD subcell. The relevance of this work to NASA is that it will result in ...

In this protocol, a facile procedure for the transfer of quantum dots or different nanoparticles from organic synthesis into aqueous solution is described. Therefore, in the first step, poly\(isobutylene maleic anhydride) is modified with hydrophobic side chains via amide bond formation. In the s...

The photophysics of silicon quantum dots (QDs) is not well understood despite their potential for many optoelectronic applications. One of the barriers to the study and widespread adoption of Si QDs is the difficulty in functionalizing their surface, to make, for example, a solution-processable electronically-activ Luminescent silicon nanostructures

Synthesis, characterization, and applications of novel thermoresponsive polymeric coatings for quantum dots (QDs) are presented. Comb-copolymers featuring hydrophobic alkyl groups, carboxylic groups and poly(N-isopropylacrylamide) (PNIPAM) side chains with molar masses ranging from 1000 g/mol to 25,400 g/mol were obtained. The amphiphilic comb-copolymers were shown to efficiently transfer the QDs to aqueous media. The PNIPAM-coated QD materials display a lower critical solution temperature (LCST). The absorbance, luminescence emission, size of the assemblies, and electrophoretic mobility were followed as a function of temperature and the reversibility of the temperature induced changes is demonstrated by cyclic heating and cooling. © 2010 Elsevier Ltd. All rights reserved ...

Device miniaturization requires an understanding of the dynamical response of materials on the nanometer scale. A great deal of experimental and theoretical work has been devoted to characterizing the excitation, charge, spin, and vibrational dynamics in a variety of novel materials, including carbon nanotubes, quantum dots, conducting polymers, inorganic semiconductors and molecular chromophores. We have developed state-of-the-art non-adiabatic molecular dynamics techniques and implemented ...

Device miniaturization requires an understanding of the dynamical response of materials on the nanometer scale. A great deal of experimental and theoretical work has been devoted to characterizing the excitation, charge, spin, and vibrational dynamics in a variety of novel materials, including carbon nanotubes, quantum dots, conducting polymers, inorganic semiconductors and molecular chromophores. We have developed state-of-the-art non-adiabatic molecular dynamics techniques and implemented ...

Silicon quantum dots (Si-QDs) have great potential for biomedical applications, including their use as biological fluorescent markers and carriers for drug delivery systems. Biologically inert Si-QDs are less toxic than conventional cadmium-based QDs, and can modify the surface of the Si-QD with covalent bond. We synthesized water-soluble alminoprofen-conjugated Si-QDs (Ap-Si). Alminoprofen is a non-steroid anti-inflammatory drug (NSAID) used as an analgesic for rheumatism. Our results showed that the

Our research in Quantum Science and Technology is largely carried in the III-V semiconductor family of materials. Much of the physics and technologies outcomes are described in the Quantum Light section of the Research tab on the web site. Sheffield is very well placed to achieve high impact in this area through its hosting of the National Epitaxy Facility for III-V materials crystal growth (http://www.nationalepitaxyfacility.co.uk/), which feeds into our wide-ranging physics and technology activities (https://ldsd.group.shef.ac.uk/).. Much of our work is based on semiconductor quantum dots, nanometre scale islands with very strong confinement which exhibit single photon emission with nearly ideal radiative and decoherence properties. A typical transmission electron microscope image of such a quantum emitter is shown above.. Our research covers a wide range of wavelengths including 900 nm, 1.3 μm and 1.55 μm which all exhibit high quality single photon emission. This has enabled a series of ...

Free Online Library: Fujitsu and Mitsui Launch QD Laser, Inc., Optical Device Venture for Commercialization of Quantum Dot Lasers. by JCN Newswires; Business

Optical coding of fusion genes using multicolor quantum dots for prostate cancer diagnosis Hyojin Lee,1,* Chloe Kim,2,* Dongjin Lee,1,3,* Jea Ho Park,1,2 Peter C Searson,2 Kwan Hyi Lee1,3 1Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea; 2Department of Materials Science and Engineering, 3Department of Biomedical Engineering, Korea University of Science and Technology (UST), Daejeon, Republic of Korea *These authors contributed equally to this work Abstract: Recent studies have found that prostate cancer expresses abnormal genetic markers including multiple types of TMPRSS2â ERG fusion genes. The expression level of different TMPRSS2â ERG fusion genes is correlated to pathologic variables of aggressive prostate cancer and disease progression. State-of-the-art methods for detection of TMPRSS2â ERG fusion genes include reverse transcription polymerase chain reaction (RT-PCR) with a detection limit of 1 fmol at

Thin-film InAs/GaAs quantum dot solar cells on mechanically flexible plastic films are fabricated. A 4.1-μm-thick compound semiconductor photovoltai

Page contains details about ZnO-graphene core-shell quantum dots film on FTO glass . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com

In the last two decades, semiconductor quantum dots small colloidal nanoparticles have garnered a great deal of scientific interest because of their unique properties. Among nanomaterials, CdTe holds special technological importance as the only known II-VI material that can form conventional p-n junctions. This makes CdTe very important for the development of novel optoelectronic devices such as light-emitting diodes, solar cells, and lasers. Moreover, the demand for water-compatible light emitters and the most common biological buffers give CdTe quantum dots fields a veritable edge in biolabeling and bioimaging.

Creative Diagnostics provides DiagNano™ CdSe Quantum Dots, 600 nm for immunoassay, bioseparation and medical imaging applications.

Organic-inorganic hybrid perovskites have recently attracted considerable interest for application in solar cells due to their low cost, high absorption coefficient and high power conversion efficiency (PCE). Herein, we utilize a CdSe quantum dot/PCBM composite as an electron transport layer (ETL) to investi

We present a semiconductor quantum optics formalism to study the dynamics of a coherently-driven semiconductor quantum dot interacting with an acoustic phonon bath and a high Q microcavity. A quantum master equation is derived in the polaron frame, where multiphoton and multiphoton effects are included to all orders. As applications of the theory, we study the Mollow triplet of a driven quantum dot in the regime of semiconductor cavity-QED. Pronounced signatures of electron-phonon-photon scattering are observed through excitation-induced dephasing and off-resonant cavity coupling. We also present an effective phonon master in Lindblad form and show example quantum trajectory simulations that help one to understand the features in the Mollow triplet spectra ...

Quantum machine learning has emerged as an exciting and promising paradigm inside quantum technologies. It may permit, on the one hand, to carry out more efficient machine learning calculations by means of quantum devices, while, on the other hand, to employ machine learning techniques to better control quantum systems. Inside quantum machine learning, quantum reinforcement learning aims at developing intelligent quantum agents that may interact with the outer world and adapt to it, with the strategy of achieving some final goal. Another paradigm inside quantum machine learning is that of quantum autoencoders, which may allow one for employing fewer resources in a quantum device via a previous supervised training. Moreover, the field of quantum biomimetics aims at establishing analogies between biological and quantum systems, to look for previously inadvertent connections that may enable useful applications. Two recent examples are the concepts of quantum artificial life, as well as of quantum ...

ABSTRACT: Graphene quantum dots (GQDs), which are atomically-thin and nanometer-wide planar carbon structures, are the most recent addition to the nanocarbon materials family. These emerging 0D materials promise a wide range of novel applications. In contrast to zero-gap 2D graphene sheets, 0D GQDs fluoresce due to quantum confinement induced bandgap opening. Also as compared to 2D graphene sheets, 0D GQDs are high dispersible; have larger fraction of edge sites; and can be more drastically tuned in chemiophysical properties through conjugation with various chemical groups, doping with heteroatoms, hybridization with other functional nanomaterials. In this presentation, we demonstrate strategies to engineering GQD bandgap, application of GQDs for bioimaging, sensing, and catalysis. Various methods to synthesize and modify GQDs will be described in conjunction with the application examples. BIOGRAPHY: After receiving b​achelors and Masters degrees from Zhejiang University (China), Dr Peng ...

摘要. A new method of preparing water-dispersible silicon quantum dots (QDs, blue spheres) has been developed by using an organic peroxide as a highly effective precursor (the lower left quarter, red and grey-green ball-and-stick model). The obtained water-dispersible carboxylic acid terminated Si QDs displayed strong and stable photoluminescence in the visible spectrum, which can be widely used in boimedical imaging. For more detail, see the Communication by S.-T. Lee, P.-F. Wang et al. on page 12872 ff.. ...

A semiconductor nanocrystal compound and probe are described. The compound is capable of linking to one or more affinity molecules. The compound comprises (1) one or more semiconductor nanocrystals capable of, in response to exposure to a first energy, providing a second energy, and (2) one or more linking agents, having a first portion linked to the one or more semiconductor nanocrystals and a second portion capable of linking to one or more affinity molecules. One or more semiconductor nanocrystal compounds are linked to one or more affinity molecules to form a semiconductor nanocrystal probe capable of bonding with one or more detectable substances in a material being analyzed, and capable of, in response to exposure to a first energy, providing a second energy. Also described are processes for respectively: making the semiconductor nanocrystal compound; making the semiconductor nanocrystal probe; and treating materials with the probe.

We have theoretically studied the combination effects of the electric and magnetic fields on the binding energy of an on-center donor impurity in disc-shaped GaAs/Al0.3Ga0.7As quantum dots (QDs) with emphasis on the competition effects between the two fields under externally applied pressure and temperature. The electric field is applied along the radial direction of the QD, while the magnetic field is applied along the growth direction. The numerical method we employed in the present calculations is the potential morphing method in the framework of the effective mass approximation. Our results show that the two fields exhibit a competition effect on the donor binding energy, leading to an invariant binding energy as in the zero field case at a critical line. This line separates the region corresponding to the red shift of the donor binding energy from the one referring to the blue shift of the binding energy. Comparing to the magnetic field effect, increasing in the QD sizes or applied ...

Fargo, N.D. - Researchers at North Dakota State University and the University of South Dakota are using computer simulations to determine whether quantum dots or nanowires would make better solar collectors for the development of future solar panels. The research team includes Andre Kryjevski, research assistant professor of physics and NDSU Center for Computationally Assisted Science and Technology; Svetlana Kilina, NDSU assistant professor of chemistry and biochemistry, and Dimitri Kilin, University of South Dakota. The teams research results are published in the American Institute of Physics Journal of Renewable and Sustainable Energy at http://dx.doi.org/10.1063/1.4817728 The group used computational modeling to examine quantum dots, one-dimensional chains of quantum dots and a nanowire to determine their potential application for solar energy collection. The results, Kryjevski said, show that placing amorphous quantum dots in an array or merging them into a nanowire results in what may be ...

In a classical random walk, a particle or walker moves stochastically around a discrete space. Quantum walks are the quantum analog, where the walker is also governed by quantum effects such as superposition, quantum interference, and entanglement. They have attracted broad interest because of a growing range of applications in quantum information processing (1-4) and quantum simulations (5, 6). Their markedly distinct properties provide a quantum speedup in solving problems, such as database search (7) and graph isomorphism (GI) (8, 9), that more broadly can be applied to pattern recognition and computer vision (10), network analysis and navigation (11), and website traffic optimization (12) and could find application in the use and analysis of large but imperfect graph states in measurement-based quantum computing (13).. Further application of quantum walks can be explored using multiple quantum walkers (14). This is because the quantum state space increases exponentially with the number of ...

TY - JOUR. T1 - Metal-insulator transition in films of doped semiconductor nanocrystals. AU - Chen, Ting. AU - Reich, K. V.. AU - Kramer, Nicolaas J.. AU - Fu, Han. AU - Kortshagen, Uwe R.. AU - Shklovskii, B. I.. PY - 2016/3/1. Y1 - 2016/3/1. N2 - To fully deploy the potential of semiconductor nanocrystal films as low-cost electronic materials, a better understanding of the amount of dopants required to make their conductivity metallic is needed. In bulk semiconductors, the critical concentration of electrons at the metal-insulator transition is described by the Mott criterion. Here, we theoretically derive the critical concentration nc for films of heavily doped nanocrystals devoid of ligands at their surface and in direct contact with each other. In the accompanying experiments, we investigate the conduction mechanism in films of phosphorus-doped, ligand-free silicon nanocrystals. At the largest electron concentration achieved in our samples, which is half the predicted nc, we find that the ...

Semiconductor LEDs are used increasingly in displays and many other applications, in part because they can efficiently produce light across a broad spectrum, from near-infrared to the ultraviolet. However, they typically emit only about two percent of the light in the desired direction: perpendicular to the diode surface. Far more light skims uselessly below the surface of the LED, because of the extreme mismatch in refraction between air and the semiconductor. The NIST nanostructured cavity boosts useful LED emission to about 41 percent and may be cheaper and more effective for some applications than conventional post-processing LED shaping and packaging methods that attempt to redirect light.. The NIST team fabricated their own infrared LEDs consisting of gallium arsenide packed with quantum dots of assorted sizes made of indium gallium arsenide. Quantum dots are nanoscale semiconductor particles that efficiently emit light at a color determined by the exact size of the particle. The LEDs ...

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Townsend Quantum Mechanics Solutions. Read and Download A Modern Approach To Quantum Mechanics Townsend Solutions Manual Free Ebooks in PDF format MODERN BUDDHISM VOLUME 1 SUTRA MODERN BUDDHISM VOLUME 2, Modern Approach To Quantum Mechanics Solutions Manual might have many A MODERN APPROACH TO QUANTUM MECHANICS TOWNSEND. (PDF) Townsend Modern Approach Quantum. A Modern Approach to Quantum Mechanics uses an innovative approach that students find both accessible and exciting. John S. Townsend Required †A Modern Approach to Quantum Mechanics, Second Edition, by John S. Townsend, A group solution will be submitted,. Read and Download A Modern Approach To Quantum Mechanics Townsend Solution Manual Free Ebooks in PDF format - 2018 AQUATRAX SERVICE MANUAL 2018 HONDA TRX450R WIRING Townsend Quantum Mechanics a Modern Approach 2e Ocr - Ebook download as PDF File (.pdf), Text File (.txt) or read book online. Quantum mechanics by Townsend, very. A Modern Approach to Quantum Mechanics uses an ...

Cancer Technologies are employed to develop new and advanced technologies for a broad range of cancer applications, especially early cancer detection, minimally invasive surgery, and targeted therapy. Specific topics include the development of new contrast agents for molecular and cellular cancer imaging; new nanoparticle drugs for targeted cancer therapy; advanced instrumentation for minimally invasive and robotic cancer surgery; engineering of the immune system and stem cells for cancer immunotherapy; and software tools and algorithms for cancer biomarker discovery and bioinformatics. A particular strength of the GT/Emory program is the development and translation of bioconjugated nanoparticles (such as semiconductor quantum dots, plasmonic nanostructures, molecular beacons, and liposomes) for in-vivo cancer imaging, molecular profiling, image-guided surgery, and personalized therapy. This research is carried out in close collaboration with the Winship Cancer Institute (WCI) of Emory ...

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Cadmium is a toxic heavy metal and so all solutions, media, bacteria, etc. containing cadmium must be disposed of as hazardous waste. In the first part of our project the E. coli must be incubated in cadmium-containing media in order to form quantum dots. This part of the project will be performed at Cooper Union in the laboratory of biomedical engineering. The laboratory at the Engineering School at Cooper Union contracts a licensed chemical waste disposal service that is handled by a designated Hazardous Waste Disposal Coordinator/Chemistry Stockroom Technician, who is responsible for scheduling and overseeing the collection of wastes (see link in section 3a). The proper disposal of media containing cadmium salts and the use of personal protective gear, such as nitrile gloves, safety goggles and laboratory coats, will greatly minimize the risks posed to team members.. One major advantage of synthesizing quantum dots biologically, as opposed to chemically, is that it allows the quantum dots to ...

High-intensity near-IR fluorescence in semiconducting polymer dots achieved by cascade FRET strategy :Near-IR (NIR) emitting semiconducting polymer dots (Pdots) with ultrabright fluorescence have been prepared for specific cellular targeting. A series of π-conjugated polymers were synthesized to form water dispersible multicomponent Pdots by an ultrasonication-assisted co-precipitation method. By optimizing cascade energy transfer in Pdots, high-intensity NIR fluorescence (Φ = 0.32) with tunable excitations, large absorption-emission separation (up to 330 nm), and narrow emission bands (FWHM = 44 nm) have been achieved. Single-particle fluorescence imaging show that the as-prepared NIR Pdots were more than three times brighter than the commercially available Qdot705 with comparable sizes under identical conditions of excitation and detection. Because of the covalent introduction of carboxylic acid groups into polymer side chains, the bioconjugation between NIR-emitting Pdots and streptavidins ...

Extreme photon localization is applicable to constructing building blocks in photonic systems and quantum information systems. A finding fact that photon localization in small space modifies the radiation process was reported in 1944 by Purcell, and advances in fabrication technology enable such structures to be constructed at optical frequencies. Many demands of building compact photonic systems and quantum information systems have enhanced activities in this field. The photonic crystal cavity has potential in providing a cavity that supports only the fundamental mode of (lambda/2n)^3 together with good confinement of light within a resonator. This thesis addresses experimental and theoretical aspects of building such photon localization blocks embedding active quantum nanostructures in a planar photonic crystal platform. Examples given in this thesis are (1) quantum dot photonic crystal nanolasers, (2) high-speed photonic crystal nanolasers, and (3) light-matter coupling in a single quantum ...

Prof.Noziks research interests include size quantization effects in semiconductor quantum dots and quantum wells, including multiple exciton generation from a single photon; the applications of unique effects in nanostructures to advanced approaches for solar photon conversion to electricity and solar fuels; photogenerated carrier relaxation dynamics in various semiconductor structures; photoelectrochemistry of semiconductor-molecule interfaces; photoelectrochemical energy conversion; photocatalysis; optical, magnetic and electrical properties of solids; and Mössbauer spectroscopy. He has published over 265 papers and book chapters in these fields, written or edited 7 books, holds 11 U.S. patents, and has delivered over 368 invited talks at universities, conferences, and symposia. He has served on numerous scientific review and advisory panels, chaired and organized many international and national conferences, and received several awards in photoconversion science ...

The transverse field Ising and XY models (the simplest quantum spin models) provide the organising principle for the rich variety of interconnected subjects which are covered in this book. From a generic introduction to in-depth discussions of the subtleties of the transverse field Ising and related models, it includes the essentials of quantum dynamics and quantum information. A wide range of relevant topics has also been provided: quantum phase transitions, various measures of quantum information, the effects of disorder and frustration, quenching dynamics and the Kibble-Zurek scaling relation, the Kitaev model, topological phases of quantum systems, and bosonisation. In addition, it also discusses the experimental studies of transverse field models (including the first experimental realisation of quantum annealing) and the recent realisation of the transverse field Ising model using tunable Josephson junctions. Further, it points to the obstacles still remaining to develop a successful quantum

Quantum biomimetics consists of reproducing in quantum systems certain properties exclusive to living organisms. Researchers at University of the Basque Country have imitated natural selection, learning and memory in a new study. The mechanisms developed could give quantum computation a boost and facilitate the learning process in machines. [14] A Chinese team of physicists have trained a quantum computer to recognise handwritten characters, the first demonstration of quantum artificial intelligence . Physicists have long claimed that quantum computers have the potential to dramatically outperform the most powerful conventional processors. The secret sauce at work here is the strange quantum phenomenon of superposition, where a quantum object can exist in two states at the same time. [13] One of biologys biggest mysteries-how a sliced up flatworm can regenerate into new organisms-has been solved independently by a computer. The discovery marks the first time that a computer has come up with ...

Professor Wongs research is in the area of nanostructured materials, heterogeneous catalysis, and bioengineering applications. The introduction of nanometer-scale features into materials elicits changes in their surface chemistry and bulk properties, and these changes can be exploited for catalytic and bioengineering applications. A particular interest lies in the facile synthesis of nanoparticles and their controlled assembly into functional materials. The physicochemical features and interparticle interaction phenomena of nanoparticles are elucidated by experimental and theoretical studies, which provide opportunities for rationally designing and engineering complex multicomposite materials on the nanometer scale. Research projects include the design of nanocrystalline metal oxides for acid and redox catalysis, nanoporous materials as catalyst supports, semiconductor quantum dots for photocatalysis, and self-assembled hollow spheres for drug delivery. ...

A water-stable semiconductor nanocrystal complex that is stable and has high luminescent quantum yield. The water-stable semiconductor nanocrystal complex has a semiconductor nanocrystal core of a III-V semiconductor nanocrystal material and a water-stabilizing layer. A method of making a water-stable semiconductor nanocrystal complex is also provided.

Selected Research Publications. Synthesis and Analysis of a Heteroleptic Coordination Compound Laverman, L.E., Misic, A. and Strouse, G.F. J. Chem. Ed. manuscript in preparation. Probing the Particle in the Box by Synthesis and Luminescence Properties of Semiconductor Quantum Dots Laverman, L.E., Strouse, G.F. and Buratto, S.K. J. Chem. Ed. manuscript in preparation.. Mechanistic studies of NO reactions with water soluble iron(II), cobalt (II) and iron(III) porphyrin complexes in aqueous solution: Implications for biological activity L. E. Laverman and P.C. Ford. J. Am. Chem. Soc., in press.. Photoreaction and photophysical mechanisms of transition metal complexes: Insights from high pressure studies. P. C. Ford & L.E. Laverman. Chpt. 7 in the book High Pressure Chemistry ed. R. van Eldik, in press.. The Synthesis of the ligand 1,5-bis[2-(3,5-dimethyl-1-pyrazolyl)ethyl]-amine-1,10-phenanthroline) and of its ruthenium(II) and rhenium(I) complexes. Binuclear species with Cu(I) and ...

A new study from Yale University shows that scientists can create and control a large quantum mechanical system built on photons, suggesting that they might be able to expand the role of photons in quantum information systems.. Light might be able to play a bigger, more versatile role in the future of quantum computing, according to new research by Yale University scientists.. A team of Yale physicists has coaxed an unprecedented number of light particles, or photons, to behave quantum mechanically, or to assume more than one state simultaneously, such as alive and dead. In this case, the light is in the form of trapped microwave photons. Control over a greater number of photons - more than 100 in this case - raises the possibility that such states of light could play the part of several quantum bits (qubits), the building blocks typically found in a quantum computer. This could potentially minimize the physical scale and cost of building one.. The quantum computer, a still embryonic ...

Engineering scalable, stable, and robust platforms for a range of functions and applications is another critical step towards practical implementation of quantum technology systems. Design and testing of the quantum functionality at both the component and system level can provide important benchmarks for the practical viability of the proposed technology. There has been considerable progress on quantum technologies, for example, with integrated optics platforms that offer reliable heralded sources of single photons and photon pairs with high emission and coupling efficiency; with on-chip entanglement control; with on-chip quantum memories with low noise and long coherence times; with efficient ion-photon interfaces; with quantum frequency converters; with low-noise integrated photon detectors; and with quantum sensing. However, the engineering of integrated platforms for reliable and efficient systems is still in its infancy. Controls and error correction, through various hardware and software ...

Quantum teleportation is the ability to transmit from one location to another without traveling through the space in between. Matter itself doesnt make this journey, only the information that describes it. This is transmitted to a new body that takes on the identity of the original.. But while science fiction fans have focused on body involved, quantum physicists are more interested in the information. For them, teleportation is the enabling technology behind a new generation of information processing technologies including a quantum Internet that allows information to be transmitted with perfect security.. One of the building blocks of the quantum Internet will be quantum routers that can receive quantum information from location and route it on to another without destroying it. So the race is on to demonstrate this kind of technology, which has the potential to revolutionize communications.. Today, Felix Bussières at the University of Geneva in Switzerland and a few pals say theyve taken an ...

If you have a question about this talk, please contact Edmund Ward.. Fully processed wafers of III -V semiconductor lasers have a potential value of tens of thousands of pounds; yield and reliability issues can therefore be very expensive. The most challenging problems occur when defects or processing issues which are introduced during fabrication are latent in the device; performance is good upon initial test, but the devices degrade during burn in or an accelerated life test trial. This talk describes the type of failure analysis study which is needed to solve these issues, using examples from work done at Bookham Technology, Caswell. Specimen preparation is challenging, requiring analysis of specific sites on individual devices, and usually several types of analysis are used, including electroluminescence, SEM , FIB and TEM - often on the same device. Results of an accelerated life test study of InAs/GaAs quantum dot lasers are also presented. These indicate that quantum dot material is ...

The physics of artificial structures of reduced dimensionality is one of the main emerging areas of condensed matter physics, and may form the basis of future terahertz electronics, quantum computing technology and novel type of materials known as metamaterials. As it was recently established arrays of quantum dots and Josephson junctions represent the most illustrative example of artificial materials with highly nonlinear and reactive properties usually characterizing metamaterial media. The Conference aims to cover these developments; in particular, recent achievements in Josephson physics, terahertz radiation, metamaterials and other related phenomena. Topics will include: arrays of Josephson junctions, quantum dots and magnetic nanoparticles; metamaterials, superlattices and band gap materials; quantum computing and tunneling phenomena; THz radiation and associated phenomena; nanotubes and nanowires; Josephson vortex dynamics. The conference aims at reviewing the fundamentals and outlining ...

By presenting both experimental and theoretical results, the distinguished authors consider solitary lasers with nano-structured material, as well as integrated devices with complex feedback sections. In so doing, they address such topics as the bifurcation theory of systems with time delay, analysis of chaotic dynamics, and the modeling of quantum transport. They also address chaos-based cryptography as an example of the technical application of highly nonlinear laser systems ...

The structure of the amino modified CdSe/ZnS core-shell QD (a) and the size distribution of the QDs (b) in the aqueous environment of living cells. The averaged

|p|We first focus on the kinetics of nanoparticle growth in a microemulsion synthesis of CdSe semiconductor nanocrystals. The process consists of a fast initial stage of typical time constant of the order of 103 s followed by a slow stage of time constant of the order of 104s. Growth proceeds similarly to that described for the hot-matrix synthesis of CdSe, underlining the generality of the two-stage growth mechanism, irrespective of the matrix type and synthesis conditions. However, the time constant of each stage in the microemulsion synthesis is much larger than in the hot-matrix one. Also, the ratio between the fast and slow time constant is appreciably bigger. We also prove that larger size reverse micelles, obtained by increasing the water:surfactant ratio, generally lead to larger CdSe nanoparticles. Bis(trimethylsilyl) selenium is the crucial precursor for the CdSe nanoparticle synthesis. An intermediate stage of the chemical reaction limiting the bis(trimethylsilyl)

In a conventional solar cell, light is absorbed by a semiconductor, producing an electron-hole (e-h) pair; the pair may be bound and is referred to as an exciton. This pair is separated by an internal electrochemical potential (present in p-n junctions or Schottky diodes) and the resulting flow of electrons and holes creates electric current. The internal electrochemical potential is created by doping one part of semiconductor interface with atoms that act as electron donors (n-type doping) and another with electron acceptors (p-type doping) that results in a p-n junction. Generation of an e-h pair requires that the photons have energy exceeding the bandgap of the material. Effectively, photons with energies lower than the bandgap do not get absorbed, while those that are higher can quickly (within about 10−13 s) thermalize to the band edges, reducing output. The former limitation reduces current, while the thermalization reduces the voltage. As a result, semiconductor cells suffer a trade-off ...

TY - JOUR. T1 - Detecting Bose-Einstein condensation of exciton-polaritons via electron transport. AU - Chen, Yueh Nan. AU - Lambert, Neill. AU - Nori, Franco. N1 - Copyright: Copyright 2010 Elsevier B.V., All rights reserved.. PY - 2009/12/30. Y1 - 2009/12/30. N2 - We examine the Bose-Einstein condensation of exciton-polaritons in a semiconductor microcavity via an electrical current. We propose that by embedding a quantum dot p-i-n junction inside the cavity, the tunneling current through the device can reveal features of condensation due to a one-to-one correspondence of the photons to the condensate polaritons. Such a device can also be used to observe the phase interference of the order parameters from two condensates.. AB - We examine the Bose-Einstein condensation of exciton-polaritons in a semiconductor microcavity via an electrical current. We propose that by embedding a quantum dot p-i-n junction inside the cavity, the tunneling current through the device can reveal features of ...

References (which are Herein Incorporated by Reference) [0343] 1. Baughman, R. H.; Zakhidov, A. A.; de Heer, W. A., Carbon nanotubes--the route toward applications. Science 2002, 297, (5582), 787-792. [0344] 2. Harutyunyan, A. R.; Pradhan, B. K.; Surnanasekera, G. U.; Korobko, E. Y.; Kuznetsov, A. A., Carbon nanotubes for medical applications. European cells and materials 2002, 3, 84-87. [0345] 3. Valcarcel, M.; Simonet, B. M.; Cardenas, S.; Suarez, B., Present and future applications of carbon nanotubes to analytical science. Analytical and Bioanalytical Chemistry 2005, 382, (8), 1783-1790. [0346] 4. OConnell, M. J., Carbon nanotubes: properties and applications. CRC Press: Boca Raton, Fla., 2006. [0347] 5. Ball, P., Roll up for the revolution. Nature 2001, 414, 142-144. [0348] 6. Taubes, An interview with Dr. Richard Smalley; ESI special topic of Nanotechnolgy. Nanotechnology 2001, http://www.esi-topics.com/nano/interviews/Richard-Smalley.html. [0349] 7. Roco, M. C., Environmentally ...

The new toxicity study was supported by the John R. Oishei Foundation, Air Force Office of Scientific Research, Singapore Ministry of Education, Nanyang Technological University, the Beijing Natural Science Foundation and the National Natural Science Foundation of China. The studys lead authors were Ling Ye of Chinese PLA General Hospital and Yong of Nanyang Technological University, who completed his PhD in chemical and biological engineering at UB in 2006.. ####. For more information, please click here. Contacts: ...

Trying to incorporate quantum dots into biological systems has proven difficult due to their lack of biocompatibility and the toxicity of heavy metals inside cells. Recently developed carbon nanodots retain the advantages of quantum dots, but can function in biological media. Xianogang Qu and researchers at the Chinese Academy of Sciences incorporated carbon nanodots in a thrombin detection assay using DNA aptamers. Thrombin contains two binding sites that are recognized by different aptamers on both a silica nanoparticle and carbon nanodot. The multi-binding site capabilities of aptamers allow for greater sensitivity when compared to single site antibodies, and the fluorescent signal of the carbon nanodot is only detected when bound to thrombin on the silica nanoparticle. Click on the paper below to read more, it will be free to read until November 16th.. Aptamer carbon nanodot sandwich used for fluorescent detection of protein ...

The mission of QICI is to promote the growth of the quantum information area in Hong Kong, and to develop Hong Kong as an international research hub for quantum information and computation. QICI has been established in November 2018 under the auspices of the HKU Department of Computer Science. Its research platform consists of 3 research teams working on quantum information theory, quantum cryptography, quantum gravity, and quantum foundations. ...

Filtering by: Committee Kindt, James, Emory University Remove constraint Committee: Kindt, James, Emory University Committee Bowman, Joel M, Emory University Remove constraint Committee: Bowman, Joel M, Emory University Department Chemistry Remove constraint Department: Chemistry Keyword quantum dots, lipid-ligand interface Remove constraint Keyword: quantum dots, lipid-ligand interface Research Field Chemistry, Polymer Remove constraint Research Field: Chemistry, Polymer ...