Secure BB84-type quantum key distribution with a simple phase error formula

2020 ◽  
Vol 45 (7) ◽  
pp. 1627 ◽  
Author(s):  
Hua-Lei Yin ◽  
Zeng-Bing Chen
Keyword(s):  
Quantum Key Distribution ◽  
Phase Error ◽  
Key Distribution ◽  
Error Formula ◽  
Simple Phase

scholarly journals Security of quantum key distribution with state-dependent imperfections

2011 ◽  
Vol 11 (11&12) ◽  
pp. 937-947
Author(s):  
Hong-Wei Li ◽  
Zhen-Qiang Yin ◽  
Shuang Wang ◽  
Wan-Su Bao ◽  
Guang-Can Guo ◽  
...  
Keyword(s):  
Error Rate ◽  
Distribution System ◽  
Quantum Channel ◽  
Quantum Key Distribution ◽  
Phase Error ◽  
Key Distribution ◽  
The State ◽  
Secret Key ◽  
Quantum Bit ◽  
State Dependent

In practical quantum key distribution system, the state preparation and measurement have state-dependent imperfections comparing with the ideal BB84 protocol. If the state-dependent imperfection can not be regarded as an unitary transformation, it should not be considered as part of quantum channel noise introduced by the eavesdropper, the commonly used secret key rate formula GLLP can not be applied correspondingly. In this paper, the unconditional security of quantum key distribution with state-dependent imperfections will be analyzed by estimating upper bound of the phase error rate in the quantum channel and the imperfect measurement. Interestingly, since Eve can not control all phase error in the quantum key distribution system, the final secret key rate under constant quantum bit error rate can be improved comparing with the perfect quantum key distribution protocol.

scholarly journals Security evaluation of quantum key distribution with weak basis-choice flaws

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shi-Hai Sun ◽  
Zhi-Yu Tian ◽  
Mei-Sheng Zhao ◽  
Yan Ma
Keyword(s):  
Quantum Key Distribution ◽  
Single Photon ◽  
Phase Error ◽  
Key Distribution ◽  
Theory And Practice ◽  
Security Evaluation ◽  
Weak Basis ◽  
Definition Of ◽  
Original Approach ◽  
Photon Source

Abstract Quantum key distribution (QKD) can share an unconditional secure key between two remote parties, but the deviation between theory and practice will break the security of the generated key. In this paper, we evaluate the security of QKD with weak basis-choice flaws, in which the random bits used by Alice and Bob are weakly controlled by Eve. Based on the definition of Li et al. (Sci Rep 5:16200, 2015) and GLLP’s analysis, we obtain a tight and analytical bound to estimate the phase error and key rate for both the single photon source and the weak coherent source. Our approach largely increases the key rate from that of the original approach. Finally, we investigate and confirm the security of BB84-QKD with a practical commercial devices.

scholarly journals Sending or Not-Sending Twin-Field Quantum Key Distribution with Flawed and Leaky Sources

Entropy ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1103
Author(s):  
Yi-Fei Lu ◽  
Yang Wang ◽  
Mu-Sheng Jiang ◽  
Xiao-Xu Zhang ◽  
Fan Liu ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Single Photon ◽  
Phase Error ◽  
Key Distribution ◽  
Practical Implementation ◽  
Decoy State ◽  
Side Channels ◽  
Optical Modes ◽  
Photon States ◽  
Selection Of

Twin-field quantum key distribution (TF-QKD) has attracted considerable attention and developed rapidly due to its ability to surpass the fundamental rate-distance limit of QKD. However, the device imperfections may compromise its practical implementations. The goal of this paper is to make it robust against the state preparation flaws (SPFs) and side channels at the light source. We adopt the sending or not-sending (SNS) TF-QKD protocol to accommodate the SPFs and multiple optical modes in the emitted states. We analyze that the flaws of the phase modulation can be overcome by regarding the deviation of the phase as phase noise and eliminating it with the post-selection of phase. To overcome the side channels, we extend the generalized loss-tolerant (GLT) method to the four-intensity decoy-state SNS protocol. Remarkably, by decomposing of the two-mode single-photon states, the phase error rate can be estimated with only four parameters. The practical security of the SNS protocol with flawed and leaky source can be guaranteed. Our results might constitute a crucial step towards guaranteeing the practical implementation of the SNS protocol.

scholarly journals Explicit asymptotic secret key rate of continuous-variable quantum key distribution with an arbitrary modulation

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 540
Author(s):  
Aurélie Denys ◽  
Peter Brown ◽  
Anthony Leverrier
Keyword(s):  
Quantum Key Distribution ◽  
Coherent States ◽  
Large Scale ◽  
Optimization Problems ◽  
Key Distribution ◽  
Continuous Variable ◽  
Secret Key ◽  
Shift Keying ◽  
Simple Phase ◽  
Numerical Precision

We establish an analytical lower bound on the asymptotic secret key rate of continuous-variable quantum key distribution with an arbitrary modulation of coherent states. Previously, such bounds were only available for protocols with a Gaussian modulation, and numerical bounds existed in the case of simple phase-shift-keying modulations. The latter bounds were obtained as a solution of convex optimization problems and our new analytical bound matches the results of Ghorai et al. (2019), up to numerical precision. The more relevant case of quadrature amplitude modulation (QAM) could not be analyzed with the previous techniques, due to their large number of coherent states. Our bound shows that relatively small constellation sizes, with say 64 states, are essentially sufficient to obtain a performance close to a true Gaussian modulation and are therefore an attractive solution for large-scale deployment of continuous-variable quantum key distribution. We also derive similar bounds when the modulation consists of arbitrary states, not necessarily pure.

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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