Quantum key distribution in an optical fiber at distances of up to 200 km and a bit rate of 180 bit/s

Glejm, A. V.; Анисимов, А. Н.; Asnis, L. N.; Vakhtomin, Y.-U. B.; Divochiy, A.; Egorov, V. I.; Kovalyuk, Vadim; Korneev, A.; Kynev, S. M.; Nazarov, Y.-U. V.; Ozhegov, R. V.; Rupasov, A. V.; Смирнов, К. В.; Smirnov, M. A.; Gol'Tsman, G. N.; Kozlov, S. A.

doi:10.3103/s1062873814030095

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…The attractive potential of SNSPDs covers several specific applications within and beyond the quantum world, some of which have already been implemented, at least partially. Such applications that have been progressed significantly in the past few years include high‐rate (1.3 Gb s −1 ) and long‐distance (404 km) quantum key distribution, long‐distance quantum communication (>1200 km), satellite laser ranging, as well as high‐definition video transmission from space (20 Mbps for 239 000 miles) . Moreover, SNSPDs are implemented in quantum cryptography and quantum tomography as well as long‐distance (>1 km) imaging, while they have been used for characterizing fundamental quantum‐mechanic properties, for example, in loophole‐free Bell tests and non‐classical single photon and phonons correlation .…”

Section: Introduction: Quantum Materials For Quantum Sensingmentioning

confidence: 99%

Superconducting Nanowires for Single‐Photon Detection: Progress, Challenges, and Opportunities

2019

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Single-photon detectors and nanoscale superconducting devices are two major candidates for realizing quantum technologies. Superconducting-nanowire single-photon detectors (SNSPDs) comprise these two solid-state and optic aspects enabling high-rate (1.3 Gb s −1 ) quantum key distribution over long distances (>400 km), long-range quantum communication (>1200 km), as well as space communication (239 000 miles). The attractiveness of SNSPDs stems from competitive performance in the four single-photon relevant characteristics at wavelengths ranges from UV to the mid-IR: high detection efficiency, low false-signal rate, low uncertainty in photon time arrival, and fast reset time. However, to date, these characteristics cannot be optimized simultaneously. In this review, the mechanisms that govern these four characteristics are presented, and it is demonstrated how they are affected by material properties and device design as well as by the operating conditions, allowing aware optimization of SNSPDs. Based on the evolution in the existing literature and state of the art, it is proposed how to choose or design the material and device for optimizing SNSPD performance, while possible future opportunities in the SNSPD technology are also highlighted.

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Section: Introduction: Quantum Materials For Quantum Sensingmentioning

confidence: 99%

Superconducting Nanowires for Single‐Photon Detection: Progress, Challenges, and Opportunities

2019

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“…Clearly, it is always beneficial to maximize the quantum channel visibility. In modern practical QC systems [3,4,[6][7][8] the achieved visibility value is usually around 98 -99 %. As is shown on Fig.…”

Section: Subcarrier Wave Quantum Communication System Clock Synchronimentioning

confidence: 99%

“…We estimate the influence of daily temperature fluctuations on the phase delay in ground-and air-based cables. Finally, we apply the calculation results to a synchronization system of a previously developed experimental SCWQC device [5][6][7][8] in order to optimize its sifted key [1] generation rate.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the optical fiber cable parameters in subcarrier wave quantum communication systems

Dubrovskaia¹,

Chivilikhin²

2016

Nanosystems: Phys. Chem. Math.

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A common approach to establishing long-distance synchronization links in quantum communication (QC) systems is based on using optical signals transmitted in cables, where they decay and are distorted. It is necessary to evaluate the transformation of the signal parameters during propagation and their influence on the QC systems. We investigate the temperature dependence of the synchronization signal phase of a subcarrier wave quantum communication system (SCWQC) in optical fiber cables. A temperature model was created in order to determine the signal phase delay in the cable. We estimate the influence of daily temperature fluctuations on the phase delay in ground-and air-based cables. For systems operating with ground-based cables, they do not have any significant impact on the synchronization of the signal phase. However, for systems operating through air-based cables, phase adjustment is required every 158 ms for stable operation. This allowed us to optimize the parameters for a calibration procedure of a previously-developed SCWQC system, increasing the overall sifted key generation rate.

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“…Here we propose an implementation of CV-QKD protocol based on subcarrier wave (SCW) technique [28][29][30][31][32][33][34][35][36] . A defining property of subcarrier wave DV-QKD is the method for quantum state encoding.…”

Section: Introductionmentioning

confidence: 99%

Subcarrier wave continuous variable quantum key distribution with discrete modulation: mathematical model and finite-key analysis

Samsonov,

Goncharov,

Gaidash

et al. 2019

Preprint

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In this paper we report a continuous-variable quantum key distribution protocol using multimode coherent states generated on subcarrier frequencies of the optical spectrum. To detect the quadrature components of bosonic field we propose a coherent detection scheme where power from a carrier wave is used as a local oscillator. We compose a mathematical model of the proposed scheme and perform its security analysis in the finite-size regime using fully quantum asymptotic equipartition property technique. We calculate a lower bound on the secret key rate for the system under the assumption that the quantum channel noise is negligible compared to detector dark counts, and an eavesdropper is restricted to collective attacks. Our calculation shows that the current realistic system implementation would allow distributing secret keys over channels with losses up to 9 dB.

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Quantum key distribution in an optical fiber at distances of up to 200 km and a bit rate of 180 bit/s

Cited by 15 publications

References 10 publications

Superconducting Nanowires for Single‐Photon Detection: Progress, Challenges, and Opportunities

Superconducting Nanowires for Single‐Photon Detection: Progress, Challenges, and Opportunities

Temperature dependence of the optical fiber cable parameters in subcarrier wave quantum communication systems

Subcarrier wave continuous variable quantum key distribution with discrete modulation: mathematical model and finite-key analysis

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