共查询到20条相似文献，搜索用时 31 毫秒
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制备出了尺寸在μm量级的球形玻璃微腔,在球形微腔中嵌入了CdSeS半导体纳米团簇结构,用一束激光激发单个微球时,球形微腔中CdSeS量子点的发光通过全内反射实现了球形回音壁模式的腔模共振,实现了受限电子态和光子态的耦合。 相似文献
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量子阱垂直腔面发射激光器及其微腔物理 总被引：1，自引：1，他引：0
根据发展历史的顺序,对量子阱垂直腔面发射激光器微腔物理进行了概述,其中包括垂直腔面发射激光器、腔量子电动力学和半导体微腔物理。给出半导体垂直腔面发射激光器及其微腔物理思想来源的详细图像。 相似文献
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根据发展历史的顺序,对量子阱垂直腔面发射激光器微腔物理进行概述,其中包括垂直腔面发射激光器、腔量子电动力学和半导体微腔物理。给出半导体垂直腔面发射激光器及其微腔物理思想来源的详细图像。 相似文献
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友清 《激光与光电子学进展》1995,32(11):12-13
量子丝微腔激光器高效率、低电流阈值半导体激光器对通讯、光学处理和光互连等许多应用是诱人的。最近为制作这种激光器所做的研究都是依靠强电子约束或光学约束，使材料态或腔模更完善地耦合到激光过程中。例如，一维量子丝的量子约束使电子态密度浓缩到窄波带内。因此，... 相似文献
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Asl&#x; D. Uurlu Henri Thyrrestrup Ravitej Uppu Claudric Ouellet‐Plamondon Rüdiger Schott Andreas D. Wieck Arne Ludwig Peter Lodahl Leonardo Midolo 《Advanced Quantum Technologies》2020,3(2)
The realization of a highly efficient optical spot‐size converter for the end‐face coupling of single photons from GaAs‐based nanophotonic waveguides with embedded quantum dots is reported. The converter is realized using an inverted taper and an epoxy polymer overlay providing a 1.3 µm output mode field diameter. The collection of single photons from a quantum dot into a lensed fiber with a rate of 5.84 ± 0.01 MHz is demonstrated and a chip‐to‐fiber coupling efficiency of is estimated. The stability and compatibility with cryogenic temperatures make the epoxy waveguides a promising material to realize efficient and scalable interconnects between heterogeneous quantum photonic integrated circuits. 相似文献
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设计了一种基于场效应晶体管的量子点场效应单光子探测器,利用二维弛豫时间的近似理论建立了二维电子气电子迁移率的散射模型,通过求解量子点场效应单光子探测器GaAs/AlxGa1-xAs二维电子气系统电子和声子相互作用的Hamiltonian函数,得到了不同温度、不同Al组分以及不同二维电子气电子面密度条件下晶格振动散射对探测器二维电子气电子迁移率的影响.仿真结果显示,提高二维电子气的电子面密度浓度和适当增大Al组分,并降低工作温度,有助于探测器获得更高的二维电子气电子迁移率. 相似文献
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Pietro Lombardi Marco Trapuzzano Maja Colautti Giancarlo Margheri Ivo Pietro Degiovanni Marco Lpez Stefan Kück Costanza Toninelli 《Advanced Quantum Technologies》2020,3(2)
Single‐photon sources (SPSs) based on quantum emitters hold promise in quantum radiometry as metrology standard for photon fluxes at the low light level. Ideally this requires control over the photon flux in a wide dynamic range, sub‐Poissonian photon statistics, and narrow‐band emission spectrum. In this work, a monochromatic SPS based on an organic dye molecule is presented, whose photon flux is traceably measured to be adjustable between 144 000 and 1320 000 photons per second at a wavelength of (785.6 ± 0.1) nm, corresponding to an optical radiant flux between 36.5 and 334 fW. The high purity of the single‐photon stream is verified, with a second‐order autocorrelation function at zero time delay below 0.1 throughout the whole range. Such molecule‐based SPS is hence used for the calibration of a single‐photon avalanche detector against a low‐noise analog photodiode traceable to the primary standard for optical radiant flux (i.e., the cryogenic radiometer). Due to the narrow bandwidth of the source, corrections to the detector efficiency arising from the spectral power distribution are negligible. With this major advantage, the developed device may finally realize a low‐photon‐flux standard source for quantum radiometry. 相似文献
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Khaled Mnaymneh Dan Dalacu Joseph McKee Jean Lapointe Sofiane Haffouz John F. Weber David B. Northeast Philip J. Poole Geof C. Aers Robin L. Williams 《Advanced Quantum Technologies》2020,3(2)
A method to integrate nanowire‐based quantum dot single photon sources on‐chip using evanescent coupling is demonstrated. By deterministically placing an appropriately tapered III‐V nanowire, containing a single quantum dot, on top of a silicon‐based ridge waveguide, the quantum dot emission directed toward the taper can be transferred to the ridge waveguide with calculated efficiencies close to 100%. As the evanescent coupling is bidirectional, the source can be optically pumped in both free‐space and through the ridge waveguide. The latter configuration paves the way toward a self‐contained, all‐fiber, plug‐and‐play solution for applications requiring a bright on‐demand single photon source. Using InAsP quantum dots embedded in InP nanowire waveguides, coupling efficiencies to a SiN ridge waveguide of 74% with a single photon purity of 97% are demonstrated. The technique to demonstrate deterministic placement of single quantum emitters onto pre‐fabricated waveguides is used, an important step toward the fabrication of complex quantum photonic circuits. 相似文献
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Single photon sources are key components for quantum technologies such as quantum communication, computing and metrology. A key challenge towards the realization of global quantum networks are transmission losses in optical fibers. Therefore, single photon sources are required to emit at the low-loss telecom wavelength bands. However, an ideal telecom wavelength single photon source has yet to be discovered. Here, we review the recent progress in realizing such sources. We start with single photon emission based on atomic ensembles and spontaneous parametric down conversion, and then focus on solid-state emitters including semiconductor quantum dots, defects in silicon carbide and carbon nanotubes. In conclusion, some state-of-the-art applications are highlighted. 相似文献
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Single-photon sources are building blocks for photonic quantum information processes. Of the many single-photon generation schemes, electrically driven single-photon sources have the advantages of realizing monolithic integration of quantum light sources and detectors without optical filtering, thus greatly simplify the integrated quantum photonic circuits. Here, we review recent advances on electrically driven single-photon sources based on solid-state quantum emitters, such as semiconductor epitaxial quantum dots, colloidal quantum dots, carbon nanotubes, molecules, and defect states in diamond, SiC and layered semiconductors. In particular, the merits and drawbacks of each system are discussed. Finally, the article is concluded by discussing the challenges that remain for electrically driven single-photon sources. 相似文献
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Anna Musia&#x; Kinga o&#x;nacz Nicole Srocka Oleh Kravets Jan Große Jacek Olszewski Krzysztof Poturaj Grzegorz Wjcik Pawe&#x; Mergo Kamil Dybka Mariusz Dyrkacz Micha&#x; D&#x;ubek Kristian Lauritsen Andreas Bülter Philipp‐Immanuel Schneider Lin Zschiedrich Sven Burger Sven Rodt Wac&#x;aw Urba&#x;czyk Grzegorz S&#x;k Stephan Reitzenstein 《Advanced Quantum Technologies》2020,3(6)
A user‐friendly, fiber‐coupled, single‐photon source operating at telecom wavelengths is a key component of photonic quantum networks providing long‐haul, ultra‐secure data exchange. To take full advantage of quantum‐mechanical data protection and to maximize the transmission rate and distance, a true quantum source providing single photons on demand is highly desirable. This great challenge is tackled by developing a ready‐to‐use semiconductor quantum‐dot‐based device that launches single photons at a wavelength of 1.3 µm directly into a single‐mode optical fiber. In the proposed approach, the quantum dot is deterministically integrated into a nanophotonic structure to ensure efficient on‐chip coupling into a fiber. The whole arrangement is integrated into a 19ʺ compatible housing to enable stand‐alone operation by cooling via a compact Stirling cryocooler. The realized source delivers single photons with a multiphoton events probability as low as 0.15 and a single‐photon emission rate of up to 73 kHz into a standard telecom single‐mode fiber. 相似文献
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Maja Colautti Pietro Lombardi Marco Trapuzzano Francesco S. Piccioli Sofia Pazzagli Bruno Tiribilli Sara Nocentini Francesco S. Cataliotti Diederik S. Wiersma Costanza Toninelli 《Advanced Quantum Technologies》2020,3(7)
The successful development of future photonic quantum technologies will much depend on the possibility of realizing robust and scalable nanophotonic devices. These should include quantum emitters like on‐demand single‐photon sources and non‐linear elements, provided their transition linewidth is broadened only by spontaneous emission. However, conventional strategies to on‐chip integration, based on lithographic processes in semiconductors, are typically detrimental to the coherence properties of the emitter. Moreover, such approaches are difficult to scale and bear limitations in terms of geometries. Here an alternative platform is discussed, based on molecules that preserve near‐Fourier‐limited fluorescence even when embedded in polymeric photonic structures. 3D patterns are achieved via direct laser writing around selected molecular emitters, with a fast, inexpensive, and scalable fabrication process. By using an integrated polymeric design, detected photon counts of about 2.4 Mcps from a single cold molecule are reported. The proposed technology will allow for competitive organic quantum devices, including integrated multi‐photon interferometers, arrays of indistinguishable single‐photon sources, and hybrid electro‐optical nanophotonic chips. 相似文献
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超导纳米线单光子探测器（SNSPD）是一种量子极限灵敏度的光探测器。它的基本原理是利用光子能量实现超导纳米线库珀对的拆对,从而在超导纳米线局域发生超导-非超导相变。和传统半导体单光子探测器相比,具有探测效率高、暗计数低、时间抖动小、死时间短、宽谱响应以及自由运行等优势。高性能SNSPD已经在量子信息、激光通信、激光雷达等领域得到了广泛应用。文中概述了过去几年间国内外在SNSPD研发、应用成果及产业化等方面的进展,并对SNSPD未来的技术发展和应用进行了展望。 相似文献
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Rigorous and intuitive master equation models are presented to study on‐demand single photon sources from pulse‐excited quantum dots coupled to optical cavities. Three methods of source excitation are considered: resonant pi‐pulse, off‐resonant phonon‐assisted inversion, and two‐photon excitation of a biexciton–exciton cascade, and the effect of the pulse excitation process on the quantum indistinguishability, efficiency, and purity of emitted photons is investigated. By explicitly modelling the time‐dependent pulsed excitation process in a manner which captures non‐Markovian effects associated with coupling to photon and phonon reservoirs, it is found that photons of near‐unity indistinguishability can be emitted with over 90% efficiency for all these schemes, with the off‐resonant schemes not necessarily requiring polarization filtering due to the frequency separation of the excitation pulse, and allowing for very high single photon purities. Furthermore, the off‐resonant methods are shown to be robust over certain parameter regimes, with less stringent requirements on the excitation pulse duration in particular. Also, a semi‐analytical simplification of the master equation is derived for the off‐resonant drive, which gives insight into the important role that exciton–phonon decoupling for a strong drive plays in the off‐resonant phonon‐assisted inversion process. 相似文献