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Passive Continuous Variable Quantum Key Distribution through the Oceanic Turbulence.

Yiwu Zhu1, Lei Mao1, Hui Hu1

  • 1School of Automation, Central South University, Changsha 410083, China.

Entropy (Basel, Switzerland)
|February 25, 2023
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Summary
This summary is machine-generated.

Continuous variable quantum key distribution (CVQKD) through seawater channels is impacted by oceanic turbulence. A non-Gaussian approach using a photon operation unit improves CVQKD performance and transmission distance in turbulent oceanic environments.

Keywords:
quantum communicationsquantum key distributionseawater channel

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Area of Science:

  • Quantum Information Science
  • Optical Communication Systems
  • Oceanic Engineering

Background:

  • Oceanic turbulence negatively impacts quantum communication system performance.
  • Continuous variable quantum key distribution (CVQKD) offers potential for secure communication through seawater channels.

Purpose of the Study:

  • To demonstrate the effects of oceanic turbulence on CVQKD performance.
  • To assess the feasibility of passive CVQKD in oceanic turbulence-based channels.
  • To improve CVQKD performance in oceanic environments.

Main Methods:

  • Characterizing channel transmittance by seawater transmission distance and depth.
  • Employing a non-Gaussian approach to counteract excess noise.
  • Utilizing numerical simulations to evaluate system performance.
  • Implementing a photon operation (PO) unit to reduce excess noise.

Main Results:

  • Oceanic turbulence significantly affects CVQKD transmission distance and depth.
  • The non-Gaussian approach and PO unit effectively reduce excess noise.
  • Performance improvements in transmission distance and depth were achieved.
  • Passive CVQKD demonstrated feasibility in turbulent oceanic channels.

Conclusions:

  • Passive CVQKD is feasible through turbulent oceanic channels.
  • Non-Gaussian methods and PO units enhance CVQKD performance in oceanic environments.
  • This research supports portable quantum communication applications via chip integration.