Experimental Twin-Field Quantum Key Distribution over 1000 km Fiber Distance

Liu, Yang; Zhang, Weijun; Jiang, Cong; Chen, Jiu-Peng; Zhang, Chi; Pan, Wen-Xin; Ma, Ding; Dong, Hui; Xiong, Jia-Min; Zhang, Chengjun; Li, Hao; Wang, Rui-Chun; Chen, Teng-Yun; You, Lixing; Wang, Xiang-Bin; Zhang, Qiang; Pan, Jian-Wei

doi:10.1103/physrevlett.130.210801

Cited by 72 publications

(13 citation statements)

References 35 publications

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“…5 that the higher the detection efficiency, the higher the key rate and the transmission distance. With the state-of-the-art superconducting nanowire single-photon detector (η A = 0.9), [30] our scheme only presents a slightly lower key rate than the one using WCS at short transmission distance (< 90 km); while shows more than 20-km longer transmission distance.…”

Section: -Intensity Wcs 4-intensity Wcs 3-intensity Hsps 4-intensity ...mentioning

confidence: 93%

Improved decoy-state quantum key distribution with uncharacterized heralded single-photon sources

Xu 徐,

Zhang 张,

Zhou 周

et al. 2024

Chinese Phys. B

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Encoding system plays a significant role in quantum key distribution (QKD). However, the security and performance of QKD systems can be compromised by encoding misalignment due to the inevitable defects in realistic devices. To alleviate the influence of misalignments, a method exploiting statistics from mismatched basis is proposed to enable uncharacterized sources to generate secure keys in QKD. In this work, we propose a scheme on four-intensity decoy-state quantum key distribution with uncharacterized heralded single-photon sources. It only requires the source states are prepared in a two-dimensional Hilbert space, and can thus reduce the complexity of practical realizations. Moreover, we carry out corresponding numerical simulations and demonstrate that our present four-intensity decoy-state scheme can achieve a much higher key rate compared than a three-intensity decoy-state method, and meantime it can obtain a longer transmission distance compared than the one using weak coherent sources.

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Section: -Intensity Wcs 4-intensity Wcs 3-intensity Hsps 4-intensity ...mentioning

confidence: 93%

Improved decoy-state quantum key distribution with uncharacterized heralded single-photon sources

Xu 徐,

Zhang 张,

Zhou 周

et al. 2024

Chinese Phys. B

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“…In 2023, the University of Science and Technology of China reported a 1002 km point-to-point fiber transmission QKD based on low-crosstalk phase reference signal control and ultra-lownoise single-photon detectors. [63] They achieved a key rate of 0.002 bit/s, breaking the record for repeaterless fiber-based QKD.…”

Section: Four-wave Mixing Sourcesmentioning

confidence: 97%

“…[61] In 2023, researchers from Nanjing University proposed a twophoton TF-QKD protocol that eliminates the strict constraints on intensity and probability, [62] in the same year, researchers from the University of Science and Technology of China achieved 100 km TF-QKD. [63] TF-QKD is a very promising field that offers new possibilities for ultra-long-distance quantum secure communication. With the continuous development of technology, we can expect more achievements in this field in the future.…”

Section: Qkd Protocols 21 Development Processmentioning

confidence: 99%

“…Further reviews of superconducting nanowire detectors can be found in Refs. [62][63][64]. The advantages of SNSPD include high detection efficiency, low dark count rate, small timing jitter, short dead time and wide spectral response, etc., and its disadvantages include low working temperature, complex equipment, etc.…”

Section: Superconducting Nanowire Single-photon Detectorsmentioning

confidence: 99%

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Research progress in quantum key distribution

Zhang 张,

Wu 吴,

Cui 崔

et al. 2023

Chinese Phys. B

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uantum Key Distribution (QKD) is a sophisticated method for securing information by leveraging the principles of quantum mechanics. Its objective is to establish a confidential key between authorized partners who are connected via both a quantum channel and a classical authentication channel. This paper presents a comprehensive overview of QKD protocols, chip-based QKD systems, quantum light sources, quantum detectors, fiber-based QKD networks, space-based QKD systems, as well as the applications and future prospects of QKD technology.

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“…While in the basic case EPR-based QKD schemes can be seen as equivalent to the P&M ones, they can also offer higher robustness against channel loss compared to practical P&M realizations [6], device-independent (DI) security based on the Bell inequality violation [7], possibility for utilization in quantum repeater schemes for extending secure distance using entanglement swapping [8], as well as scalability which allows performing QKD between multiple users [9,10]. Nowadays QKD schemes based on twin-field [11] or measurement-device-independent (MDI) [12][13][14] protocols are capable of distributing secure cryptographic keys on the distances of several hundred [15] or even one thousand [16] kilometers, at least in laboratory conditions.…”

Section: Introductionmentioning

confidence: 99%

Robustness of entanglement-based discrete- and continuous-variable quantum key distribution against channel noise

Lasota,

Kovalenko,

Usenko

2023

New J. Phys.

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Discrete-variable (DV) and continuous-variable (CV) schemes constitute the two major families of quantum key distribution (QKD) protocols. Unfortunately, since the setup elements required by these schemes are quite different, making a fair comparison of their potential performance in particular applications is often troublesome, limiting the experimenters’ capability to choose an optimal solution. In this work we perform a general comparison of the major entanglement-based DV and CV QKD protocols in terms of their resistance to the channel noise, with the otherwise perfect setup, showing the definite superiority of the DV family. We analytically derive fundamental bounds on the tolerable channel noise and attenuation for entanglement-based CV QKD protocols. We also investigate the influence of DV QKD setup imperfections on the obtained results in order to determine benchmarks for the parameters of realistic photon sources and detectors, allowing the realistic DV protocols to outperform even the ideal CV QKD analogs. Our results indicate the realistic advantage of DV entanglement-based schemes over their CV counterparts and suggests the practical efforts for maximizing this advantage.

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Experimental Twin-Field Quantum Key Distribution over 1000 km Fiber Distance

Cited by 72 publications

References 35 publications

Improved decoy-state quantum key distribution with uncharacterized heralded single-photon sources

Improved decoy-state quantum key distribution with uncharacterized heralded single-photon sources

Research progress in quantum key distribution

Robustness of entanglement-based discrete- and continuous-variable quantum key distribution against channel noise

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