Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevApplied.12.024048
Title: Practical quantum key distribution with non-phase-randomized coherent states
Authors: Li Liu
WANG YUKUN 
Emilien Lavie
Chao Wang
Arno Ricou
Fen Zhuo Guo
LIM CI WEN 
Keywords: Quantum cryptography
quantum cryptography, tomographic, bell diagonal states, semiconductor single photon source, advantage distillation, coherent attack
Quantum key distribution
Issue Date: 24-Aug-2019
Publisher: American Physical Society
Citation: Li Liu, WANG YUKUN, Emilien Lavie, Chao Wang, Arno Ricou, Fen Zhuo Guo, LIM CI WEN (2019-08-24). Practical quantum key distribution with non-phase-randomized coherent states. Physical Review Applied 12 (2) : 024048. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevApplied.12.024048
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
Abstract: Quantum key distribution (QKD) based on coherent states is well known for its implementation simplicity, but it suffers from loss-dependent attacks based on optimal unambiguous state discrimination. Crucially, previous research has suggested that coherent-state QKD is limited to short distances, typically below 100 km assuming standard optical fiber loss and system parameters. In this work, we propose a six-coherent-state phase-encoding QKD protocol that is able to tolerate the total loss of up to 38 dB assuming realistic system parameters, and up to 56 dB loss assuming zero noise. The security of the protocol is calculated using a recently developed security proof technique based on semi-definite programming, which assumes only the inner-product information of the encoded coherent states, the expected statistics, and that the measurement is basis-independent. Our results thus suggest that coherent-state QKD could be a promising candidate for high-speed provably-secure QKD.
Source Title: Physical Review Applied
URI: https://scholarbank.nus.edu.sg/handle/10635/167087
ISSN: 2331-7019
DOI: 10.1103/PhysRevApplied.12.024048
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
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