Implementation of quantum key distribution surpassing the linear rate-transmittance bound

Fang, Xiaotian; Zeng, Pei; Liu, Hui; Zou, Mi; Wu, Wei; Tang, Yan-Lin; Sheng, Ying-Jie; Xiang, Yang; Zhang, Weijun; Li, Hao; Wang, Zhen; You, Lixing; Li, Mingjun; Chen, Hao; Chen, Yu-Ao; Zhang, Qiang; Peng, Cheng-Zhi; Ma, Xiongfeng; Chen, Teng-Yun; Pan, Jian-Wei

doi:10.1038/s41566-020-0599-8

Cited by 187 publications

(101 citation statements)

References 20 publications

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“…Note that the current record of 502 km in optical fiber has been achieved by the phase-matching DV-QKD of Ref. [44], which is not a one-way protocol but exploits an intermediate twin field node [45].…”

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confidence: 99%

Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber

et al. 2020

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Quantum key distribution provides secure keys resistant to code-breaking quantum computers. The continuous-variable version of quantum key distribution offers the advantages of higher secret key rates in metropolitan areas, as well as the use of standard telecom components that can operate at room temperature. However, the transmission distance of these systems (compared with discrete-variable systems) are currently limited and considered unsuitable for long-distance distribution. Herein, we report the experimental results of long distance continuous-variable quantum key distribution over 202.81 km of ultralow-loss optical fiber by suitably controlling the excess noise and employing highly-efficient reconciliation procedures. This record-breaking implementation of the continuous-variable quantum key distribution doubles the previous distance record and shows the road for long-distance and large-scale secure quantum key distribution using room-temperature standard telecom components.

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confidence: 99%

Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber

et al. 2020

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“…The performance of SNSPDs has been effectively enhanced based on improved knowledge and experience in materials, design, fabrication process, and the theory. Numerous milestones in QI experiments have been achieved using SNSPDs with unparalleled parameters, such as loophole-free tests of local realism [63], QKD with over 500 km of optical fiber [64,65], and boson sampling with 20 input photons [60]. Another successful milestone that was achieved outside the scope of QI is deep-space communication [26].…”

Section: Snspd 31 Historymentioning

confidence: 99%

Superconducting nanowire single-photon detectors for quantum information

You

2020

Nanophotonics

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AbstractThe superconducting nanowire single-photon detector (SNSPD) is a quantum-limit superconducting optical detector based on the Cooper-pair breaking effect by a single photon, which exhibits a higher detection efficiency, lower dark count rate, higher counting rate, and lower timing jitter when compared with those exhibited by its counterparts. SNSPDs have been extensively applied in quantum information processing, including quantum key distribution and optical quantum computation. In this review, we present the requirements of single-photon detectors from quantum information, as well as the principle, key metrics, latest performance issues, and other issues associated with SNSPD. The representative applications of SNSPDs with respect to quantum information will also be covered.

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“…Among all protocols, TF QKD 10 promises high key rates over long distances to beat the repeater-less bound, which enhances the key rate to a square-root scaling ( √ η) to the channel transmittance. Significantly, the experimental demonstrations of TF-QKD 24-29 achieved a record-long distribution distance of more than 500 km 28,29 . However, all these experiments were implemented in a laboratory, leaving the question that whether this fancy protocol is feasible in a practical scenario.…”

Section: Introductionmentioning

confidence: 99%

Twin-Field Quantum Key Distribution over 511 km Optical Fiber Linking two Distant Metropolitans

Chen

Zhang

Liu

et al. 2021

Preprint

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The basic principle of quantum mechanics guarantee the unconditional security of quantum key distribution (QKD) at the cost of inability of amplification of quantum state. As a result, despite remarkable progress in worldwide metropolitan QKD networks over the past decades, long haul fiber QKD network without trustful relay has not been achieved yet. Here, through sending-or-not-sending (SNS) protocol, we complete a twin field QKD (TF-QKD) and distribute secure keys without any trusted repeater over a 511 km long haul fiber trunk linking two distant metropolitans. Our secure key rate is around 3 orders of magnitudes greater than what is expected if the previous QKD field test system over the same length were applied. The efficient quantum-state transmission and stable single-photon interference over such a long distance deployed fiber paves the way to large-scale fiber quantum networks.

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Implementation of quantum key distribution surpassing the linear rate-transmittance bound

Cited by 187 publications

References 20 publications

Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber

Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber

Superconducting nanowire single-photon detectors for quantum information

Twin-Field Quantum Key Distribution over 511 km Optical Fiber Linking two Distant Metropolitans

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