scholarly journals Twin-Field Quantum Key Distribution with Discrete-Phase-Randomized Sources

2020 ◽  
Vol 14 (6) ◽  
Author(s):  
Chun-Mei Zhang ◽  
Yi-Wei Xu ◽  
Rong Wang ◽  
Qin Wang
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Discrete Phase

scholarly journals Discrete-phase-randomized coherent state source and its application in quantum key distribution

2015 ◽  
Vol 17 (5) ◽  
pp. 053014 ◽  
Author(s):  
Zhu Cao ◽  
Zhen Zhang ◽  
Hoi-Kwong Lo ◽  
Xiongfeng Ma
Keyword(s):  
Coherent State ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Discrete Phase

scholarly journals Phase-Matching Quantum Key Distribution with Discrete Phase Randomization

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 508
Author(s):  
Xiaoxu Zhang ◽  
Yang Wang ◽  
Musheng Jiang ◽  
Yifei Lu ◽  
Hongwei Li ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Photon Number ◽  
Key Distribution ◽  
Continuous Phase ◽  
Phase Matching ◽  
Decoy State ◽  
State Discrimination ◽  
Discrete Phase ◽  
And Performance ◽  
Phase Randomization

The twin-field quantum key distribution (TF-QKD) protocol and its variations have been proposed to overcome the linear Pirandola–Laurenza–Ottaviani–Banchi (PLOB) bound. One variation called phase-matching QKD (PM-QKD) protocol employs discrete phase randomization and the phase post-compensation technique to improve the key rate quadratically. However, the discrete phase randomization opens a loophole to threaten the actual security. In this paper, we first introduce the unambiguous state discrimination (USD) measurement and the photon-number-splitting (PNS) attack against PM-QKD with imperfect phase randomization. Then, we prove the rigorous security of decoy state PM-QKD with discrete phase randomization. Simulation results show that, considering the intrinsic bit error rate and sifting factor, there is an optimal discrete phase randomization value to guarantee security and performance. Furthermore, as the number of discrete phase randomization increases, the key rate of adopting vacuum and one decoy state approaches infinite decoy states, the key rate between discrete phase randomization and continuous phase randomization is almost the same.

Quantum Key Distribution: Attacks and Solutions

2020 ◽  
Author(s):  
Vimal Gaur ◽  
Devika Mehra ◽  
Anchit Aggarwal ◽  
Raveena Kumari ◽  
Srishti Rawat
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution
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