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Single Photon Emission From Gaas Quantum Dots Embedded In Nanowiressupported By The National Key Basic Research Program Of China Under Grant No 2013cb922304 And The National Natural Science Foundation Of China Under Grant Nos 11474275 And 11204297
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Book Synopsis Single-Photon Emission from GaAs Quantum Dots Embedded in Nanowires*Supported by the National Key Basic Research Program of China Under Grant No 2013CB922304, and the National Natural Science Foundation of China Under Grant Nos 11474275 and 11204297 by :
Download or read book Single-Photon Emission from GaAs Quantum Dots Embedded in Nanowires*Supported by the National Key Basic Research Program of China Under Grant No 2013CB922304, and the National Natural Science Foundation of China Under Grant Nos 11474275 and 11204297 written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : A highly efficient single-photon source based on a semiconductor quantum dot (QD) is a promising candidate in quantum information processing. We report a single-photon source based on self-assembled GaAs QDs in nanowires with an extraction efficiency of 14%. The second-order correlation function g (2) (0) at saturate excitation power is estimated to be 0.28. The measured polarization of QD emission depends on the geometric relations between the directions of PL collection and the long axis of nanowires.
Book Synopsis Self-Assembled InGaAs/GaAs Quantum Dots by :
Download or read book Self-Assembled InGaAs/GaAs Quantum Dots written by and published by Academic Press. This book was released on 1999-03-29 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is concerned with the crystal growth, optical properties, and optical device application of the self-formed quantum dot, which is one of the major current subjects in the semiconductor research field.The atom-like density of states in quantum dots is expected to drastically improve semiconductor laser performance, and to develop new optical devices. However, since the first theoretical prediction for its great possibilities was presented in 1982, due to the difficulty of their fabrication process. Recently, the advent of self-organized quantum dots has made it possible to apply the results in important optical devices, and further progress is expected in the near future.The authors, working for Fujitsu Laboratories, are leading this quantum-dot research field. In this volume, they describe the state of the art in the entire field, with particular emphasis on practical applications.
Book Synopsis Sub-Poissonian Photon Emission in Coupled Double Quantum Dots–cavity System*Project Supported by the National Natural Science Foundation of China (Grant Nos. 61372037 and 61401035), the Beijing Excellent Ph.D. Thesis Guidance Foundation, China (Grant No. 20131001301), and the Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), China (Grant No. IPOC2015ZC05). by :
Download or read book Sub-Poissonian Photon Emission in Coupled Double Quantum Dots–cavity System*Project Supported by the National Natural Science Foundation of China (Grant Nos. 61372037 and 61401035), the Beijing Excellent Ph.D. Thesis Guidance Foundation, China (Grant No. 20131001301), and the Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), China (Grant No. IPOC2015ZC05). written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this work, we theoretically analyze the few-photon emissions generated in a coupled double quantum dots (CDQDs)-single mode microcavity system, under continuous wave and pulse excitation. Compared with the uncoupled case, strong sub-Poissonian character is achieved in a CDQDs–cavity system at a certain laser frequency. Based on the proposed scheme, single photon generation can be obtained separately under QD–cavity resonant condition and off-resonant condition. For different cavity decay rates, we reveal that laser frequency detunings of minimum second-order autocorrelation function are discrete and can be divided into three regions. Moreover, the non-ideal situation where two QDs are not identical is discussed, indicating the robustness of the proposed scheme, which possesses sub-Poissonian character in a large QD difference variation range.
Book Synopsis Characterizing Single Photon Emission from Quantum Dots in Nanowires by : Morgan Mastrovich
Download or read book Characterizing Single Photon Emission from Quantum Dots in Nanowires written by Morgan Mastrovich and published by . This book was released on 2019 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bright sources of highly indistinguishable single photons are desirable for diverse applications in quantum technology, including quantum cryptographic protocols, information processing, and metrology. The most common single photon source for quantum optical experiments is currently spontaneous parametric downconversion (SPDC); quantum dot sources have the potential to greatly exceed the brightness of these current sources, without compromising the quality of the emitted photons. Embedding a quantum dot within a tapered nanowire waveguide greatly increases the photon extraction efficiency. Exciting a two-photon resonant transition decreases the emission time jitter, improving both the multi-photon suppression and indistinguishability. Before this work, these two techniques have not yet been implemented together. We implemented two-photon resonant excitation (TPRE) for the first time in nanowire-embedded quantum dots; we found that it significantly improved the multi-photon suppression. However, we were unable to measure the indistinguishability due to low counts and instabilities in the experimental apparatus. Nevertheless, we have identified the significant improvements that are still required in order to successfully measure the indistinguishability under TPRE; with these improvements, the measurement should be possible for future group members. We successfully measured the indistinguishability under a quasi-resonant excitation, but did not find a significant difference when comparing to the measurement made on a similar quantum dot under above-bandgap excitation. We must also substantially improve the single photon count rate in order to approach the polarization entanglement rates of SPDC sources. Despite these challenges, nanowire-embedded quantum dots remain a promising source of both single and entangled pairs of photons.
Book Synopsis Nanowire Quantum Dots as Sources of Single and Entangled Photons by : Milad Khoshnegar Shahrestani
Download or read book Nanowire Quantum Dots as Sources of Single and Entangled Photons written by Milad Khoshnegar Shahrestani and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Realization of linear quantum computation and establishing secure quantum communication among interacting parties demand for triggered quantum sources delivering genuine single and entangled photons. However, the intrinsic energy level spectrum of nanostructures made by the nature or developed under a random growth process energetically lacks the expected figures of merit to produce such quantized states of photons. Here, I present the semi-empirical modeling and experimental investigation on the spin fine structure of strongly confining quantum dots embedded in III-V nanowires. To this end, the quantum dot is numerically modeled via the Configuration Interaction method at two different levels: 1) single-particle level, where its pure energy level structure is resolved in the presence of strain and spin-orbit interaction. 2) Few-particle level, at which the few-body interactions appear as perturbative energy corrections and orbital correlations. I demonstrate the influence of quantum confinement on the binding energies and spin fine structure of excitons in the absence of hyperfine interaction. Importantly, the high-symmetry character of excitonic orbitals in nanowire quantum dots restore the degeneracy of optically-active ground-state excitons, offering an ideal spectrum for the entangled photon pair generation. To experimentally verify the idea, we design and fabricate defect-free nanowire quantum dots with ultra-clean excitonic spectrum, and construct the time correlation function of emitted photons through performing a series of low-temperature statistical quantum optics measurements. We observe a decent performance in terms of single photon generation under low excitation powers. Moreover, photon pairs emitted from the biexciton-exciton cascade of nanowire quantum dots exhibit color indistinguishability and polarization entanglement owing to the trivial fine structure splitting of the ground-state excitons. We further extend the idea by proposing the hybridized states of a nanowire-based quantum dot molecule as the potential source of higher-order entangled states. Tracing the field-dependent spectrum suggests the appearance of dominant features under the weak localization of electrons and coherent tunneling of holes. In addition to their Coulomb correlation, excitons also remain spatially correlated, opening new transition channels normally forbidden in the ground state of a single dot. The proposed structure can be exploited to create tripartite hybrid, GHZ and W-entangled states.
Book Synopsis Metal–organic–vapor Phase Epitaxy of InGaN Quantum Dots and Their Applications in Light-emitting Diodes *Project Supported by the National Basic Research Program of China (Grant Nos. 2013CB632804, 2011CB301900, and 2012CB3155605), the National Natural Science Foundation of China (Grant Nos. 61176015, 61210014, 51002085, 61321004, 61307024, and 61176059), and the High Technology Research and Development Program of China (Grant No. 2012AA050601). by :
Download or read book Metal–organic–vapor Phase Epitaxy of InGaN Quantum Dots and Their Applications in Light-emitting Diodes *Project Supported by the National Basic Research Program of China (Grant Nos. 2013CB632804, 2011CB301900, and 2012CB3155605), the National Natural Science Foundation of China (Grant Nos. 61176015, 61210014, 51002085, 61321004, 61307024, and 61176059), and the High Technology Research and Development Program of China (Grant No. 2012AA050601). written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: InGaN quantum dot is a promising optoelectronic material, which combines the advantages of low-dimensional and wide-gap semiconductors. The growth of InGaN quantum dots is still not mature, especially the growth by metal–organic–vapor phase epitaxy (MOVPE), which is challenge due to the lack of itin-situ monitoring tool. In this paper, we reviewed the development of InGaN quantum dot growth by MOVPE, including our work on growth of near-UV, green, and red InGaN quantum dots. In addition, we also introduced the applications of InGaN quantum dots on visible light emitting diodes.
Book Synopsis Convenient Synthesis of Stable Silver Quantum Dots with Enhanced Photoluminescence Emission by Laser Fragmentation*Project Supported by the National Natural Science Foundation of China (Grant Nos. 11575102, 11105085, 11275116, and 11375108) and the Fundamental Research Funds of Shandong University, China (Grant No. 2015JC007). by :
Download or read book Convenient Synthesis of Stable Silver Quantum Dots with Enhanced Photoluminescence Emission by Laser Fragmentation*Project Supported by the National Natural Science Foundation of China (Grant Nos. 11575102, 11105085, 11275116, and 11375108) and the Fundamental Research Funds of Shandong University, China (Grant No. 2015JC007). written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A new strategy for the facile synthesis of very stable and mono-dispersed silver (Ag) quantum dots (QDs) is developed by laser fragmentation of bulk Ag in water using polysorbate 80 as a dispersing and stabilizing agent. The surfactant plays an important role in the formation of size-controlled Ag nano-structures. The Ag QDs have excellent photo-stability of ∼500 h and enhanced photoluminescence (PL) at 510 nm. This has significant implications for selective and ultrasensitive PL probes. Based on laser fragmentation in the biocompatible surfactant solution, our results have opened up a novel paradigm to obtain stable metal QDs directly from bulk targets. This is a breakthrough in the toxicity problems that arise from standard chemical fabrication.
