Experimental Quantum Communication Overcomes the Rate-Loss Limit without Global Phase Tracking

Zhou, Lai; Lin, Jian; Xie, Yuan-Mei; Lu, Yu-Shuo; Jing, Yumang; Yin, Hua-Lei; Zhong, Yuan

doi:10.1103/physrevlett.130.250801

Cited by 63 publications

(21 citation statements)

References 52 publications

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“…[51] In 2023, the Beijing Academy of Quantum Information Sciences experimentally overcame the rate-loss limit without global phase tracking. [52] Researchers from the University of Science and 124207-3 Technology of China demonstrated intercity mode-pairing MDI-QKD without global phase-locking. [53] In 2018, Lucamarini et al proposed a two-field quantum key distribution protocol that breaks the PLOB bound, twinfield quantum key distribution, TF-QKD.…”

Section: Qkd Protocols 21 Development Processmentioning

confidence: 99%

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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Section: Qkd Protocols 21 Development Processmentioning

confidence: 99%

Research progress in quantum key distribution

Zhang 张,

Wu 吴,

Cui 崔

et al. 2023

Chinese Phys. B

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“…Most MDI-QKD studies currently focus on equal distances between users and untrusted third parties [40,41,45,51,52]. However, Alice and Bob's channels to Charles often exhibit varying transmittance due to geographic disparities.…”

Section: Introductionmentioning

confidence: 99%

Boosting asymmetric measurement-device-independent quantum key distribution via numerical-analysis technology

Li,

Zheng,

Zhang

et al. 2024

Phys. Scr.

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Asymmetric measurement-device-independent quantum key distribution (MDI-QKD) enables building a scalable, high-rate quantum network with an untrusted relay in real-world scenarios. In this study, we improve the performance of asymmetric MDI-QKD using numerical analysis techniques. Simulation results show a twofold increase in tolerance to basis misalignment compared to the previous state-of-the-art method. Specifically, for instances of substantial basis misalignment, the key rate increases by an order of magnitude, and the maximum communication distance extends by 20 km. Our work significantly enhances the robustness and feasibility of asymmetric MDI-QKD, thereby promoting the widespread deployment of MDI-QKD networks.

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“…Quantum key distribution (QKD) establishes information-theoretically secure keys between two remote users [1]. Since the first QKD protocol (BB84) was proposed [2], many progresses have been achieved theoretically and experimentally in tackling the potential attack from eavesdropper [3][4][5][6][7][8][9], extending the QKD distance [10][11][12][13][14][15][16][17][18] and improving the secure key rate (SKR) [19,20]. Among the different experimental implementations of QKD, the entanglement-based scheme [21,22] exploits the intrinsic correlation of quantum entanglement to distribute cryptographic keys, which dispenses with the need for random number generators.…”

Section: Introductionmentioning

confidence: 99%

High-dimensional quantum key distribution using energy-time entanglement over 242 km partially deployed fiber

Liu,

Lin,

Liu

et al. 2023

Quantum Sci. Technol.

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Entanglement-based quantum key distribution (QKD) is an essential ingredient in quantum communication, owing to the property of source-independent security and the potential on constructing large-scale quantum communication networks. However, implementation of entanglement-based QKD over long-distance optical fiber links is still challenging, especially over deployed fibers. In this work, we report an experimental QKD using energy-time entangled photon pairs that transmit over optical fibers of 242 km (including a section of 19 km deployed fibers). The QKD is realized through the protocol of dispersive-optics QKD (DO-QKD) with high-dimensional encoding to utilize coincidence counts more efficiently. A reliable, high-accuracy time synchronization technology for long-distance entanglement-based QKD is developed based on the distribution of optical pulses in quantum channels. Our system operates continuously for more than 7 d without active polarization or phase calibration. We ultimately generate secure keys with secure key rates of 0.22 bps and 0.06 bps in the asymptotic and finite-size regimes, respectively. It shows that entanglement-based DO-QKD is reliable for long-distance realization in the field if its high requirement on time synchronization is satisfied.

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Experimental Quantum Communication Overcomes the Rate-Loss Limit without Global Phase Tracking

Cited by 63 publications

References 52 publications

Research progress in quantum key distribution

Research progress in quantum key distribution

Boosting asymmetric measurement-device-independent quantum key distribution via numerical-analysis technology

High-dimensional quantum key distribution using energy-time entanglement over 242 km partially deployed fiber

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