Discrete-phase-randomized twin-field quantum key distribution with advantage distillation

Zhang, Chun-Mei; Wang, Zhe; Wu, Yu-Da; Zhu, Jian-Rong; Wang, Rong; Li, Hong-Wei

doi:10.1103/physreva.109.052432

Phys. Rev. A

2024

DOI: 10.1103/physreva.109.052432

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Discrete-phase-randomized twin-field quantum key distribution with advantage distillation

Chun-Mei Zhang,

Zhe Wang,

Yu-Da Wu

et al.

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Cited by 3 publications

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Majorisation‐minimisation algorithm for optimal state discrimination in quantum communications

Kundu,

Babu,

Stoica

2024

IET Quantum Communication

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Designing optimal measurement operators for quantum state discrimination (QSD) is an important problem in quantum communications and cryptography applications. Prior works have demonstrated that optimal quantum measurement operators can be obtained by solving a convex semidefinite program (SDP). However, solving the SDP can represent a high computational burden for many real‐time quantum communication systems. To address this issue, a majorisation‐minimisation (MM)‐based algorithm, called Quantum Majorisation‐Minimisation (QMM) is proposed for solving the QSD problem. In QMM, the authors reparametrise the original objective, then tightly upper‐bound it at any given iterate, and obtain the next iterate as a closed‐form solution to the upper‐bound minimisation problem. Our numerical simulations demonstrate that the proposed QMM algorithm significantly outperforms the state‐of‐the‐art SDP algorithm in terms of speed, while maintaining comparable performance for solving QSD problems in quantum communication applications.

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Majorisation‐minimisation algorithm for optimal state discrimination in quantum communications

Kundu,

Babu,

Stoica

2024

IET Quantum Communication

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Practical asynchronous measurement-device-independent quantum key distribution with advantage distillation

Luo,

Liu,

Qin

et al. 2024

Phys. Rev. A

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Efficient source-independent quantum conference key agreement

Bao,

Xiao,

Song

et al. 2024

Opt. Express

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Quantum conference key agreement (QCKA) enables the unconditional secure distribution of conference keys among multiple participants. Due to challenges in high-fidelity preparation and long-distance distribution of multi-photon entanglement, entanglement-based QCKA is facing severe limitations in both key rate and scalability. Here, we propose a source-independent QCKA scheme utilizing the post-matching method, feasible within the entangled photon pair distribution network. We introduce an equivalent distributing virtual multi-photon entanglement protocol for providing unconditional security proof even in the case of coherent attacks. For the symmetry star network, compared with the previous n-photon entanglement protocol, the conference key rate is improved from O(η n ) to O(η2), where η is the transmittance from the entanglement source to one participant. Simulation results show that the performance of our protocol has multiple orders of magnitude advantages in the intercity distance. We anticipate that our approach will demonstrate its potential in the implementation of quantum networks.

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Discrete-phase-randomized twin-field quantum key distribution with advantage distillation

Cited by 3 publications

References 57 publications

Majorisation‐minimisation algorithm for optimal state discrimination in quantum communications

Majorisation‐minimisation algorithm for optimal state discrimination in quantum communications

Practical asynchronous measurement-device-independent quantum key distribution with advantage distillation

Efficient source-independent quantum conference key agreement

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