Laser beam propagation effects on secure key rates for satellite-to-ground discrete modulation CV-QKD

Tyan Lin Wang, Ivan B. Djordjevic, James Nagel

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The increasing prevalence of satellite-to-ground laser communications necessitates unconditional security measures that so far can only be provided by quantum key distribution. However, in a free-space optical channel, the diffraction of laser beams along with turbulence effects can reduce the initially high secure key rates potentially provided by continuous variable quantum key distribution (CV-QKD). Using derived formulas from four-state discrete modulation CV-QKD with reverse reconciliation, we highlight parameters that yield key rates on the order of 50 Mbps, and then describe the possible factors that can cause its reduction in a free-space optical channel. Numerical beam propagation simulations are performed to supplement the analyses.

Original languageEnglish (US)
Pages (from-to)8061-8068
Number of pages8
JournalApplied optics
Volume58
Issue number29
DOIs
StatePublished - Oct 10 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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