Integrating machine learning to achieve an automatic parameter prediction for practical continuous-variable quantum key distribution

Weiqi Liu, Peng Huang, Jinye Peng, Jianping Fan, and Guihua Zeng
Phys. Rev. A 97, 022316 – Published 12 February 2018

Abstract

For supporting practical quantum key distribution (QKD), it is critical to stabilize the physical parameters of signals, e.g., the intensity, phase, and polarization of the laser signals, so that such QKD systems can achieve better performance and practical security. In this paper, an approach is developed by integrating a support vector regression (SVR) model to optimize the performance and practical security of the QKD system. First, a SVR model is learned to precisely predict the time-along evolutions of the physical parameters of signals. Second, such predicted time-along evolutions are employed as feedback to control the QKD system for achieving the optimal performance and practical security. Finally, our proposed approach is exemplified by using the intensity evolution of laser light and a local oscillator pulse in the Gaussian modulated coherent state QKD system. Our experimental results have demonstrated three significant benefits of our SVR-based approach: (1) it can allow the QKD system to achieve optimal performance and practical security, (2) it does not require any additional resources and any real-time monitoring module to support automatic prediction of the time-along evolutions of the physical parameters of signals, and (3) it is applicable to any measurable physical parameter of signals in the practical QKD system.

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  • Received 2 July 2017

DOI:https://doi.org/10.1103/PhysRevA.97.022316

©2018 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Weiqi Liu1, Peng Huang2, Jinye Peng1, Jianping Fan3, and Guihua Zeng1,2,*

  • 1College of Information Science and Technology, Northwest University, Xi'an 710127, Shaanxi, China
  • 2Center of Quantum Sensing and Information Processing (QSIP), State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
  • 3Department of Computer Science, University of North Carolina-Charlotte, Charlotte, North Carolina 28223, USA

  • *ghzeng@sjtu.edu.cn

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Vol. 97, Iss. 2 — February 2018

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