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检索条件"任意字段=Conference on Advances in Photonics of Quantum Computing, Memory, and Communication XII"

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A post-processing-free single-photon random number generator with ultra-low latency 12

A post-processing-free single-photon random number generator...

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conference on advances in photonics of quantum computing, memory, and communication xii

作者： Wayne, Michael A. Migdall, Alan L. Levine, Zachary H. Bienfang, Joshua C. NIST 100 Bur Dr Gaithersburg MD 20899 USA NIST Joint Quantum Inst 100 Bur Dr Gaithersburg MD 20899 USA Univ Maryland 100 Bur Dr Gaithersburg MD 20899 USA

ISBN: (数字)9781510625099

ISBN: (纸本)9781510625099

The low-latency requirements of a loophole-free Bell test prohibit time-consuming post-processing steps that arc often used to improve the statistical quality of a physical random number generator (RNG). Here we demonstrate a post-processing-free RNG that produces a random bit within 2.4(2) ns of an input trigger. We use the Allan variance as a tool for characterizing non-idealities in the RNG and designing a feedback mechanism to account for and correct long-term drift. The impact of the feedback on the predictability of the output is less than 6.4 x 10(7), and results in a system capable of 24 hour operation with output that is statistically indistinguishable from a balanced Bernoulli process.

关键词： single-photon random number generator low latency quantum information Bell test

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Improved reconciliation for continuous-variable quantum key distribution 12

Improved reconciliation for continuous-variable quantum key ...

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conference on advances in photonics of quantum computing, memory, and communication xii

作者： Gyongyosi, L. Imre, S. Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England Budapest Univ Technol & Econ Dept Telecommun Quantum Technol Lab 2 Magyar Tudosok Krt H-1111 Budapest Hungary Hungarian Acad Sci MTA BME Informat Syst Res Grp H-1518 Budapest Hungary

ISBN: (数字)9781510625099

ISBN: (纸本)9781510625099

The performance of a continuous-variable quantum key distribution (CVQKD) protocol depends on the efficiency of the post-processing of measurement results. The post-processing methods extract statistical information from the raw data, establish the mutual knowledge between the parties, and produce a final key that provides absolute security. Here we define an optimization method for post-processing in continuous-variable quantum key distribution. The optimization framework allows significant performance improvements in the post-processing phase compared to other existing reconciliation approaches.

关键词： quantum key distribution continuous-variable quantum key distribution quantum cryptography quantum communication quantum Shannon theory

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Parallel preparation of a set of arbitrary path-polarization hyperentangled states 12

Parallel preparation of a set of arbitrary path-polarization...

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conference on advances in photonics of quantum computing, memory, and communication xii

作者： Garalnaby, Hussien Hegazy, Salem F. Elnaby, Salah L. Hassab Cairo Univ Natl Inst Laser Enhanced Sci Giza 12613 Egypt Zewail City Sci & Technol Giza 12578 Egypt

ISBN: (数字)9781510625099

ISBN: (纸本)9781510625099

The simultaneous production of a set of arbitrary hyperentangled states is crucial for quantum machines running variant quantum protocols concurrently, like universal quantum computers and quantum communication hubs. We present an experimental method to prepare a set of arbitrary path-polarization hyperentangled states concurrently using non-collinear spontaneous parametric down-conversion (SPDC). A cascaded pair of type-I crystals are pumped by 405-nm diagonally-polarized beam to produce a noncollinear stream of photon pairs. Compensation crystals are inserted to correct for the angular slope of the relative phase of the produced polarization entangled state. The path-entangled states are created over four pairs of slits positioned at conjugate locations to the pump beam. The local relative-phases of the path and polarization states can be independently tailored by intercepting the SPDC emission by tiltable birefringent and glass plates. The amplitudes of the polarization states is controlled by the manipulation of the polarization state of the pump. Also, the amplitudes of the path states is accessed by translating the slits over the SPDC cone. Here, while a pure state describes the whole SPDC emission, the produced states can be deemed an independent set by avoiding paths balanced to less than the coherence-length.

关键词： quantum optics nonlinear optics hyperentanglement compensation

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Hyper-entanglement signals in quantum optical circuits 12

Hyper-entanglement signals in quantum optical circuits

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conference on advances in photonics of quantum computing, memory, and communication xii

作者： Nikulin, Vladimir V. Fang, Rushui Hughes, David H. SUNY Binghamton Dept Elect & Comp Engn Binghamton NY 13902 USA Air Force Res Lab 26 Elect Pkwy Rome NY 13441 USA

ISBN: (数字)9781510625099

ISBN: (纸本)9781510625099

Secure free-space data links can be established using conventional laser communication technology or, if necessary, they can be further enhanced with quantum encryption. Security features of these systems are based on the protocols that make use of the inherent properties of laser light. In this case, encryption does not rely on complex mathematical algorithms that add overhead to the communication stream, but instead it is based on physical-layer processes in the laser sources and other modulating components. One promising approach is based on polarization entanglement between correlated photon pairs to achieve data encryption in quantum communication systems. The foundation of security lies in the response of photons to polarization measurements. Additional degrees of freedom can be added to each "single-particle" state by using hyper-entanglement. The situation can be visualized when several carrier waves are assigned specific frequencies in the 100 GHz International Telecommunication Union (ITU) grid. The two technologies that can be eventually integrated to achieve this task include hyperspectral quantum circuits and the entangled pair source and detection systems. This results in frequency/polarization hyper-entanglement, which can be processed with additional wavelength-division multiplexing (WDM) components to achieve efficient separation of the signals It is important to understand that most of the previous work is theoretical and assumes ideal properties of all optical parts. In reality, many non-ideal features of the quantum circuits and their components can change the way the quantum states are processed, and this constitutes the main focus of our paper.

关键词： quantum communication entangled photons quantum states wavelength division multiplexing

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quantum state tomography of ultrafast optical pulses at telecom wavelength by broadband balanced homodyne detection 12

Quantum state tomography of ultrafast optical pulses at tele...

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conference on advances in photonics of quantum computing, memory, and communication xii

作者： Blesin, Terence Matsushita, Rei Akahane, Kouichi Ishi-Hayase, Junko Keio Univ Sch Fundamental Sci & Technol Kohoku Ku 3-14-1 Hiyoshi Yokohama Kanagawa 2238522 Japan Natl Inst Informat & Commun Technol NICT 4-2-1 Nukui Kitamachi Koganei Tokyo 1848795 Japan

ISBN: (数字)9781510625099

ISBN: (纸本)9781510625099

The efficient transfer of a quantum state from photons to matter qubits in order to momentarily store information has become a central problem in quantum information processing. A quantum memory turns out to be an essential tool to achieve advanced technologies such as quantum networks, quantum repeaters, deterministic single photon sources or linear optics quantum computers. The realization of a quantum interface has been investigated in various forms, among which one can find solid-state atomic ensembles, color centers in crystal lattices, cold atomic gases, optical phonons in diamond and many others. Here we focus on a broadband quantum interface for high repetition rate (76 MHz) ultrafast optical pulses (250 fs) at telecommunication wavelength (1530 nm) based on the photon echo process occurring in semiconductor quantum dots. We evaluated the quantum state of photonic qubits in order to characterize the impact of the storage on the transmitted signal. Homodyne traces corresponding to projections of the Wigner function of the signal on rotated quadrature components were obtained using broadband balanced homodyne detection, i.e. mixing the ultrafast optical pulses to analyze with a high repetition rate pulsed local oscillator. The reconstruction of the Wigner function from the homodyne traces was performed using three algorithms: the inverse Radon transform, the minimax adaptive reconstruction and the maximum likelihood estimation. The three methods lead to similar results, concluding that for an input pulse in a coherent state, the reemitted photon echo is also in a coherent state.

关键词： quantum state tomography photon echo broadband quantum interface maximum likelihood estimation inverse Radon transform minimax algorithm ultrafast optical pulses telecommunication wavelength

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Photon-Number-Resolving Transition-Edge Sensors for the Metrology of Photonic Microstructures based on Semiconductor quantum Dots 12

Photon-Number-Resolving Transition-Edge Sensors for the Metr...

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conference on advances in photonics of quantum computing, memory, and communication xii

作者： Schmidt, Marco von Helversen, Martin Schlottmann, Elisabeth Lopez, Marco Gericke, Fabian Schulze, Jan-Hindrik Strittmatter, Andre Schneider, Christian Kueck, Stefan Hoefling, Sven Heindel, Tobias Beyer, Joern Reitzenstein, Stephan Tech Univ Berlin Inst Festkorperphys Hardenbergstr 36 D-10623 Berlin Germany Phys Tech Bundesanstalt Abbestr 2-12 D-10587 Berlin Germany Phys Tech Bundesanstalt Bundesallee 100 D-38116 Braunschweig Germany Univ Wurzburg Tech Phys D-97074 Wurzburg Germany

ISBN: (数字)9781510625099

ISBN: (纸本)9781510625099

Light sources for applications in quantum information, quantum-enhanced sensing and quantum metrology are attracting increasing scientific interest. To gain inside into the underlying physical processes of quantum light generation, efficient photon detectors and experimental techniques are required to access the photon statistics. In this work, we employ photon-number-resolving (PNR) detectors based on superconducting transition-edge sensors (TESs) for the metrology of photonic microstrctures with semiconductor quantum dots (QDs) as emitters. For the PNR analysis, we developed a state of the art PNR detection system based on fiber-coupled superconducting TESs. Our stand-alone system comprises six tungsten TESs, read out by six 2-stage-SQUID current sensors, and operated in a compact detector unit integrated into an adiabatic demagnetization refrigerator. This PNR detection system enables us to directly access the photon statistics of the light field emitted by our photonic microstructures. In this contribution, we focus on the PNR study of deterministically fabricated quantum light sources emitting single indistinguishable photons as well as twin-photon states. Additionally, we present a PNR-analysis of electrically pumped QD micropillar lasers exhibiting a peculiar bimodal behavior. Employing TESs our work provides direct insight into the complex emission characteristics of QD-based light sources. We anticipate, that TES-based PNR detectors, will be a viable tool for implementations of photonic quantum information processing relying on multi-photon states.

关键词： Transition-edge sensors SQUIDs quantum Metrology Photon number resolution quantum Dot Microlaser

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Technological advances on Si and Si3N4 low-losses waveguide platforms for nonlinear and quantum optics applications 12

Technological advances on Si and Si3N4 low-losses waveguide ...

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advances in photonics of quantum computing, memory, and communication xii 2019

作者： Bellegarde, Cyril El Dirani, Houssein Letartre, Xavier Petit-Etienne, Camille Monat, Christelle Hartmann, Jean-Michel Sciancalepore, Corrado Pargon, Erwine Univ. Grenoble Alpes CEA-LETI Minatec Optics and Photonics Division 17 rue des Martyrs GrenobleF-38054 France LTM Centre National de la Recherche Scientifique University Grenoble Alpes Grenoble38000 France Institut des Nanotechnologies de Lyon UMR CNRS 5270 Ecole Centrale Lyon Ecully France

ISBN: (数字)9781510625099

ISBN: (纸本)9781510625082

In this communication, we report on the design, fabrication, and testing of silicon-on-insulator (SOI) and silicon-nitrideon-insulator (SiNOI) photonic circuits for nonlinear and quantum optics applications. As recently demonstrated, the generation of correlated photons on Si platforms can be used for quantum cryptography and quantum computing. Concerning SiNOI waveguides, Kerr frequency combs have been proposed in many applications, such as atomic clocks, on-chip spectroscopy, and terabit coherent communications. Silicon is an attractive platforms for correlated photons sources because of its high nonlinearity, they can have several modes in telecom band with sharp line widths (tens of μeV) and its inherent complementary metal-oxide-semiconductor (CMOS) compatibility. Moreover, the SiNOI is an attractive platform for Kerr comb generation due to their large bandgap and consequently the low two-photon absorption in the telecommunication band. Furthermore, in all the previous SiNOI-based frequency combs, the silicon nitride film undergoes long and high-temperature annealing to reduce the absorption in the telecommunication band caused by the dangling N-H bonds, thus making such annealed Si3N4 films non-CMOS compatible. However, both in the case of correlated photons pairs generation and Kerr frequency combs, the source efficiency is related to the quality factor (Q), so that a high-Q resonator is required to get highly-efficient sources. Authors report here about the fabrication and the characterization of annealing-free CMOS-compatible SiNOI- A nd hydrogen-annealed silicon-based waveguides and microresonators featuring ultra-low losses (e.g., 0.6 dB/cm for single-mode Si waveguides) that can be used, respectively, as efficient sources for Kerr combs and correlated photon pairs sources. © 2019 SPIE.

关键词： Silicon nitride

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Analysis of (hyper-) entanglement in quantum dot systems 11

Analysis of (hyper-) entanglement in quantum dot systems

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conference on advances in photonics of quantum computing, memory, and communication XI

作者： Prilmuller, M. Weihs, G. Predojevic, A. Univ Innsbruck Inst Expt Phys Technikerstr 25d A-6020 Innsbruck Austria Ulm Univ Inst Quantum Opt Albert Einstein Allee 11 D-89081 Ulm Germany

Entangled and hyper-entangled states of light are valuable tools of quantum information protocols. Here, we discuss entanglement generation in quantum dot systems and its extension to hyper entanglement. We review the... 详细信息

ISBN: (数字)9781510615809

ISBN: (纸本)9781510615809

关键词： quantum dots non-classical light entanglement single photons

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Secure quantum Clock Synchronization 11

Secure Quantum Clock Synchronization

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conference on advances in photonics of quantum computing, memory, and communication XI

作者： Lamas-Linares, Antia Troupe, James Univ Texas Austin Texas Adv Comp Ctr Austin TX 78712 USA Univ Texas Austin Appl Res Labs Austin TX 78713 USA

ISBN: (数字)9781510615809

ISBN: (纸本)9781510615809

The ability to synchronize remote clocks plays an increasingly important role in our infrastructure, from maintaining coherence in the electrical grid to allowing precise positioning and navigation for civilian and military applications. However, many of the techniques to establish and maintain this time synchronization have been shown to be susceptible to interference by malicious parties. Here we propose a protocol that builds on techniques from quantum communication to provide a verified and secure time synchronization protocol. In contrast with classical protocols aimed at increasing the security of time distribution, we need not make any assumptions about the distance or propagation times between the clocks. In order to compromise the security of the protocol, an adversary must be able to perform quantum non-demolition measurements of the presence of a singe photon with high probability. The requirement of such quantum measurements raises a serious technological barrier for any would-be adversary.

关键词： Clock Synchronization Security quantum communication quantum Optics Metrology

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Superdense coding for quantum networking environments 11

Superdense coding for quantum networking environments

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conference on advances in photonics of quantum computing, memory, and communication XI

作者： Williams, Brian P. Sadlier, Ronald J. Humble, Travis S. Oak Ridge Natl Lab One Bethel Valley Rd Oak Ridge TN 37831 USA Univ Tennessee Bredesen Ctr Knoxville TN 37996 USA

ISBN: (数字)9781510615809

ISBN: (纸本)9781510615809

quantum networks provide a versatile infrastructure for communication, computing, and sensing with quantum information. Novel sources and detectors for transmitting and receiving quantum states are critical elements in the development and eventual deployment of robust quantum networks. Alongside performance, the compatibility of quantum network devices with modern networking infrastructure is an important requirement for deployment. We present results on the integration of quantum communication using superdense coding transmitted over optical fiber links into network environments. Our approach takes advantage of a novel complete Bell-state measurement setup that relies on hyper-entanglement in the temporal and polarization degrees of freedom for a two-photon state emitted from a quantum light source. Using linear optics and common single-photon detectors, we record a single-qubit channel capacity of 1.665 +/- 0.018. We then demonstrate a full experimental implementation of hybrid, quantum-classical communication protocol for image transfer applications. Our devices integrate with existing fiber optical network and software-de fined transmitters and receivers as part of a modular design to provide an extensible quantum communication system that can adapt to future quantum technology goals.

关键词： quantum Networks quantum communication

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