Continuous-variable quantum key distribution with non-Gaussian operations

Liyun Hu, M. Al-amri, Zeyang Liao, and M. S. Zubairy
Phys. Rev. A 102, 012608 – Published 6 July 2020

Abstract

Continuous-variable quantum key distribution (CV-QKD) provides an effective way to obtain the high secret key rate, but is limited by practical techniques. To overcome this limitation, we investigate the performance of CV-QKD protocols when non-Gaussian operations are applied to both sides of the channels, including photon subtraction and addition, and photon catalysis. A comparison is also made between Gaussian modulation and non-Gaussian modulation. We show that the optimal transmission distance cannot be improved by non-Gaussian modulation at the sender's side, but it can be improved by single-photon catalysis at the receiver's side. For a given modulation variance that exceeds a certain threshold, the performance of the zero-photon catalysis at the sender's side is the best when compared with other non-Gaussian modulations (except single-photon catalysis at the receiver's side), and it can always reach the optimal distance. Our paper will provide a useful insight for the use of non-Gaussian modulation to other CV-QKD protocols.

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  • Received 25 March 2020
  • Accepted 17 June 2020

DOI:https://doi.org/10.1103/PhysRevA.102.012608

©2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Liyun Hu1,2,*, M. Al-amri1,3,4,5,†, Zeyang Liao6, and M. S. Zubairy1,‡

  • 1Institute for Quantum Science and Engineering and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
  • 2Center for Quantum Science and Technology, Jiangxi Normal University, Nanchang 330022, China
  • 3CQOQI, KACST, Riyadh 11442, Saudi Arabia
  • 4The National Center for Laser and Optoelectronics, KACST, Riyadh 11442, Saudi Arabia
  • 5Department of Physics, KKU, P.O. Box 9004, Abha 61413, Saudi Arabia
  • 6School of Physics, Sun Yat-sen University, Guangzhou 510275, China

  • *hlyun@jxnu.edu.cn
  • mdalamri@kacst.edu.sa
  • zubairy@physics.tamu.edu

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Vol. 102, Iss. 1 — July 2020

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