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

Peng Huang, Jingzheng Huang, Zheshen Zhang, and Guihua Zeng
Phys. Rev. A 97, 042311 – Published 9 April 2018

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.

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  • Received 23 November 2017
  • Revised 27 February 2018

DOI:https://doi.org/10.1103/PhysRevA.97.042311

©2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Quantum Information, Science & Technology

Authors & Affiliations

Peng Huang1,*, Jingzheng Huang1, Zheshen Zhang2, and Guihua Zeng1,†

  • 1Center for Quantum Sensing and Information Processing, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Department of Materials Science and Engineering, College of Optical Sciences, University of Arizona, Tucson Arizona 85721, USA

  • *huang.peng@sjtu.edu.cn
  • ghzeng@sjtu.edu.cn

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Issue

Vol. 97, Iss. 4 — April 2018

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