Quantum key distribution using basis encoding of Gaussian-modulated coherent states
AffiliationUniv Arizona, Dept Mat Sci & Engn, Coll Opt Sci, Tucson, AZ 85721 USA
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationHuang, P., Huang, J., Zhang, Z., & Zeng, G. (2018). Quantum key distribution using basis encoding of Gaussian-modulated coherent states. Physical Review A, 97(4), 042311.
JournalPHYSICAL REVIEW A
Rights©2018 American Physical Society
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractThe continuous-variable quantum key distribution (CVQKD) has been demonstrated to be available in practical secure quantum cryptography. However, its performance is restricted strongly by the channel excess noise and the reconciliation efficiency. In this paper, we present a quantum key distribution (QKD) protocol by encoding the secret keys on the random choices of two measurement bases: the conjugate quadratures X and P. The employed encoding method can dramatically weaken the effects of channel excess noise and reconciliation efficiency on the performance of the QKD protocol. Subsequently, the proposed scheme exhibits the capability to tolerate much higher excess noise and enables us to reach a much longer secure transmission distance even at lower reconciliation efficiency. The proposal can work alternatively to strengthen significantly the performance of the known Gaussian-modulated CVQKD protocol and serve as a multiplier for practical secure quantum cryptography with continuous variables.
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VersionFinal published version
SponsorsNational Natural Science Foundation of China [61332019, 61671287, 61631014]; National Key Research and Development Program [2016YFA0302600]