Quantum Key Distribution over 658 km Fiber with Distributed Vibration Sensing

Chen, Jiu-Peng; Zhang, Chi; Liu, Yang; Jiang, Cong; Zhao, Dixian; Zhang, Weijun; Chen, Faxi; Li, Hao; You, Lixing; Wang, Zhen; Chen, Yang; Wang, Xiang-Bin; Zhang, Qiang; Pan, Jian-Wei

doi:10.1103/physrevlett.128.180502

Cited by 43 publications

(20 citation statements)

References 44 publications

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“…Based on this criteria, we list in Table 1 the X-basis QBER for experiments that adopted also the SNS protocol. Within the margin of error, our system gives even a slightly better QBER of 4.75 % than the other setups 28 , 33 , showing no performance degradation from using truly independent lasers between an open quantum channel.…”

Section: Resultsmentioning

confidence: 80%

“…Within the margin of error, our system gives even a slightly better QBER of 4.75 % than the other setups 28 , 33 , showing no performance degradation from using truly independent lasers between an open quantum channel.…”

Section: Resultsmentioning

confidence: 80%

“…Security against general attacks was proven for protocol variants 15 – 21 , among which sending-not-sending (SNS) 17 and no-phase-post selection (NPP) 18 – 20 remove partially the need for phase slice reconciliation and thus improve key generation efficiency. An exciting collection of experiments 22 – 33 has successfully validated TF-QKD’s superior rate-loss scaling and repeatedly broken the communication distance record, which now stands at 833 km 32 .…”

Section: Introductionmentioning

confidence: 99%

“…Here, each user generates their local frequency comb and transmits one comb line to Charlie for interference, the outcome of which feeds into a photon-counting proportional-integral-derivative (PID) controller that allows rapid reading out and zeroing the laser frequency difference as well as cancelling the fibre fluctuation. Importantly, our solution brings neither performance degradation nor loss of practicality thanks partly to its choice of proven ingredients including ultra-stable lasers 30 , 33 , optical frequency combs 31 , and dual-wavelength stabilisation 28 , 31 .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Twin-field quantum key distribution without optical frequency dissemination

et al. 2023

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Twin-field (TF) quantum key distribution (QKD) has rapidly risen as the most viable solution to long-distance secure fibre communication thanks to its fundamentally repeater-like rate-loss scaling. However, its implementation complexity, if not successfully addressed, could impede or even prevent its advance into real-world. To satisfy its requirement for twin-field coherence, all present setups adopted essentially a gigantic, resource-inefficient interferometer structure that lacks scalability that mature QKD systems provide with simplex quantum links. Here we introduce a technique that can stabilise an open channel without using a closed interferometer and has general applicability to phase-sensitive quantum communications. Using locally generated frequency combs to establish mutual coherence, we develop a simple and versatile TF-QKD setup that does not need service fibre and can operate over links of 100 km asymmetry. We confirm the setup’s repeater-like behaviour and obtain a finite-size rate of 0.32 bit/s at a distance of 615.6 km.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Twin-field quantum key distribution without optical frequency dissemination

et al. 2023

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“…S INCE the first quantum key distribution (QKD) protocol proposed in 1984 [1], remarkable breakthroughs have been made in the past few decades, including fiber links [2]- [9], free-space links [10]- [14], and even satellite-based links [15]- [19]. Recently, an international space race toward practical quantum networks has begun, and several proposals for satellites and quantum constellations have been reported [20]- [26].…”

Section: Introductionmentioning

confidence: 99%

Intrinsically Stable 2-GHz Polarization Modulation for Satellite-Based Quantum Key Distribution

Luo

et al. 2022

IEEE Photonics J.

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Satellite-based quantum key distribution (QKD) has made significant strides in the past few years, and an international space race toward practical quantum networks has begun. Being one major encoding method, highly robust, highperformance and miniaturized polarization modulation is critical to meet the needs of future satellite applications. Here, we employ the Sagnac-based method to realize inherent-stable polarization modulation and propose a novel optical design to achieve a stateof-the-art repetition rate of 2 GHz. This value approaches the theoretical repetition frequency limit with commercially-available phase modulators. Furthermore, the polarization encoder is miniaturized into a robust 6.0 cm × 6.5 cm module and two commercially mature phase modulators. A 90-min consecutive test was successfully performed, verifying the robustness of this scheme with an average quantum bit error rate as low as 0.42%. The presented intrinsically stable high-speed polarization modulation provides an effective solution for future satellite applications.

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Site‐Selective Enhancement of Superconducting Nanowire Single‐Photon Detectors via Local Helium Ion Irradiation

Strohauer,

Wietschorke,

Zugliani

et al. 2023

Adv Quantum Tech

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Achieving homogeneous performance metrics between nominally identical pixels is challenging for the operation of arrays of superconducting nanowire single‐photon detectors (SNSPDs). Here, local helium ion irradiation is utilized to post‐process and tune single‐photon detection efficiency, switching current, and critical temperature of individual devices on the same chip. For 12 nm thick highly absorptive SNSPDs, which are barely sensitive to single photons with a wavelength of 780 nm prior to He ion irradiation, an increase of the system detection efficiency from <0.05% to (55.3 1.1)% is observed following irradiation. Moreover, the internal detection efficiency saturates at a temperature of 4.5 K after irradiation with 1800 ions nm−2. Compared to 8 nm SNSPDs of similar detection efficiency, a doubling of the switching current (to 20 µA) is observed for irradiated 10 nm thick detectors, increasing the amplitude of detection voltage pulses. Investigations of the scaling of superconducting thin film properties with irradiation up to a fluence of 2600 ions nm−2 revealed an increase of sheet resistance and a decrease of critical temperature towards high fluences. A physical model accounting for defect generation and sputtering during helium ion irradiation is presented and shows good qualitative agreement with experiments.

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Quantum Key Distribution over 658 km Fiber with Distributed Vibration Sensing

Cited by 43 publications

References 44 publications

Twin-field quantum key distribution without optical frequency dissemination

Twin-field quantum key distribution without optical frequency dissemination

Intrinsically Stable 2-GHz Polarization Modulation for Satellite-Based Quantum Key Distribution

Site‐Selective Enhancement of Superconducting Nanowire Single‐Photon Detectors via Local Helium Ion Irradiation

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