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Article: Discrete-phase-randomized coherent state source and its application in quantum key distribution

TitleDiscrete-phase-randomized coherent state source and its application in quantum key distribution
Authors
KeywordsDiscrete phase randomization
Quantum key distribution
Coherent state
Decoy state
Issue Date2015
Citation
New Journal of Physics, 2015, v. 17, article no. 053014 How to Cite?
Abstract© 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Coherent state photon sources are widely used in quantum information processing. In many applications, such as quantum key distribution (QKD), a coherent state functions as a mixture of Fock states by assuming that its phase is continuously randomized. In practice, such a crucial assumption is often not satisfied, and therefore the security of existing QKD experiments is not guaranteed. To bridge this gap, we provide a rigorous security proof of QKD with discrete-phase-randomized coherent state sources. Our results show that the performance of the discrete-phase randomization case is close to its continuous counterpart with only a small number (say, 10) of discrete phases. Compared to the conventional continuous phase randomization case, where an infinite amount of random bits are required, our result shows that only a small amount (say, 4 bits) of randomness is needed.
Persistent Identifierhttp://hdl.handle.net/10722/285952
ISSN
2023 Impact Factor: 2.8
2023 SCImago Journal Rankings: 1.090
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorCao, Zhu-
dc.contributor.authorZhang, Zhen-
dc.contributor.authorLo, Hoi Kwong-
dc.contributor.authorMa, Xiongfeng-
dc.date.accessioned2020-08-18T04:57:04Z-
dc.date.available2020-08-18T04:57:04Z-
dc.date.issued2015-
dc.identifier.citationNew Journal of Physics, 2015, v. 17, article no. 053014-
dc.identifier.issn1367-2630-
dc.identifier.urihttp://hdl.handle.net/10722/285952-
dc.description.abstract© 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Coherent state photon sources are widely used in quantum information processing. In many applications, such as quantum key distribution (QKD), a coherent state functions as a mixture of Fock states by assuming that its phase is continuously randomized. In practice, such a crucial assumption is often not satisfied, and therefore the security of existing QKD experiments is not guaranteed. To bridge this gap, we provide a rigorous security proof of QKD with discrete-phase-randomized coherent state sources. Our results show that the performance of the discrete-phase randomization case is close to its continuous counterpart with only a small number (say, 10) of discrete phases. Compared to the conventional continuous phase randomization case, where an infinite amount of random bits are required, our result shows that only a small amount (say, 4 bits) of randomness is needed.-
dc.languageeng-
dc.relation.ispartofNew Journal of Physics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectDiscrete phase randomization-
dc.subjectQuantum key distribution-
dc.subjectCoherent state-
dc.subjectDecoy state-
dc.titleDiscrete-phase-randomized coherent state source and its application in quantum key distribution-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1088/1367-2630/17/5/053014-
dc.identifier.scopuseid_2-s2.0-84930221792-
dc.identifier.volume17-
dc.identifier.spagearticle no. 053014-
dc.identifier.epagearticle no. 053014-
dc.identifier.isiWOS:000355279000001-
dc.identifier.issnl1367-2630-

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