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Proof-of-Principle Demonstration of Fully Passive Quantum Key Distribution.

Chengqiu Hu1, Wenyuan Wang1, Kai-Sum Chan1,2

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|September 29, 2023
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Summary
This summary is machine-generated.

This study demonstrates a fully passive quantum key distribution (QKD) system using polarization encoding. This active-modulation-free approach enhances practical security by eliminating device-based side-channel risks.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Applied Physics

Background:

  • Quantum key distribution (QKD) provides information-theoretic security.
  • Active modulators in QKD systems can introduce side-channel leakage, compromising security.
  • Previous attempts at passive QKD faced theoretical and security verification challenges.

Purpose of the Study:

  • To demonstrate a fully passive quantum key distribution (QKD) scheme.
  • To overcome limitations of previous passive QKD protocols.
  • To achieve practical security in QKD by removing active modulation.

Main Methods:

  • Utilized gain-switching technique combined with a postselection scheme.
  • Employed polarization encoding for quantum key distribution.
  • Performed proof-of-principle demonstration at various channel loss levels (7.2 dB, 11.6 dB, 16.7 dB).

Main Results:

  • Successfully demonstrated a fully passive QKD system.
  • Achieved feasibility of active-modulation-free QKD in polarization-encoded systems.
  • Validated the protocol's performance under significant channel losses.

Conclusions:

  • Fully passive QKD is feasible in polarization-encoded systems.
  • The developed method enhances practical security by eliminating active modulation.
  • This work paves the way for more secure and robust QKD implementations.