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Mapping Guaranteed Positive Secret Key Rates for Continuous Variable Quantum Key Distribution.

Mikhael T Sayat1,2,3,4, Oliver Thearle2,5, Biveen Shajilal3,4

  • 1Department of Physics, Faculty of Science, University of Auckland, Auckland 1010, New Zealand.

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Summary
This summary is machine-generated.

This study introduces a new tool to assess continuous variable quantum key distribution (CVQKD) protocols by considering multiple parameters simultaneously. The M-QAM protocol demonstrates superior performance in generating secure quantum keys compared to M-APSK and M-PSK protocols.

Keywords:
comparison toolcontinuous variablediscrete modulatednumerical analysisprotocolquantum key distribution

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Optical Communication Systems

Background:

  • Traditional continuous variable quantum key distribution (CVQKD) performance evaluation uses single-parameter analysis, neglecting interdependencies.
  • This atomistic approach is insufficient for understanding protocol capabilities under realistic, fluctuating channel conditions.

Purpose of the Study:

  • To develop a numerical tool for holistic CVQKD protocol comparison.
  • To analyze the simultaneous impact of multiple parameters on secret key rate (SKR) generation.
  • To identify optimal CVQKD protocols for unstable quantum communication channels.

Main Methods:

  • Developed a numerical tool to evaluate CVQKD protocols considering multiple parameters concurrently.
  • Mapped regions of positive secret key rate (SKR) within the parameter space of transmittance, excess noise, and modulation amplitude.
  • Compared three discrete modulated (DM) CVQKD protocols: M-QAM, M-APSK, and M-PSK.

Main Results:

  • The M-QAM protocol was found to outperform M-APSK and M-PSK protocols in generating positive SKRs.
  • A non-linear increase in SKR generation capability was observed with an increasing number of coherent states.
  • Identified specific parameter space regions where protocols can achieve positive SKRs.

Conclusions:

  • The developed tool provides a more comprehensive assessment of CVQKD protocol performance than traditional methods.
  • The M-QAM protocol is a promising candidate for secure communication in dynamic environments like free-space optics.
  • This holistic approach aids in selecting optimal CVQKD protocols for real-world applications with fluctuating channel characteristics.