Performance of continuous variable quantum key distribution system at different detector bandwidth

X. Tang, R. Kumar, S. Ren, A. Wonfor, R. V. Penty, I. H. White

Research output: Contribution to journalArticlepeer-review

11 Citations (SciVal)


We evaluate the performance of Gaussian Modulated Coherent State (GMCS) Continuous-Variable Quantum Key Distribution (CV-QKD), in terms of secure key rate, at different detector bandwidths. We illustrate the advantages and limitations of high-speed CV-QKD systems using a general noise model in which we consider various noise sources and their dependence upon detection bandwidth. Experimentally, the feasibility of high speed CV-QKD is demonstrated by using a GHz bandwidth balanced homodyne detector (BHD) established with commercially available components. We provide secure key rates of transmitted and local local oscillator schemes under various clock rates.

Original languageEnglish
Article number126034
JournalOptics Communications
Early online date27 Apr 2020
Publication statusPublished - 15 Sept 2020


  • Balanced homodyne detector
  • Continuous variable quantum key distribution
  • Gaussian modulated coherent state protocol
  • Quantum key distribution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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