Quantum key distribution using basis encoding of Gaussian-modulated coherent states

Peng Huang, Jingzheng Huang, Zheshen Zhang, Guihua Zeng

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The 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.

Original languageEnglish (US)
Article number042311
JournalPhysical Review A
Volume97
Issue number4
DOIs
StatePublished - Apr 9 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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