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Covert Quantum Communication.

Juan Miguel Arrazola1, Valerio Scarani1,2

  • 1Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.

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|December 31, 2016
PubMed
Summary
This summary is machine-generated.

Covert quantum communication is now possible over noisy optical channels using single photons or coherent states. A new hybrid protocol enables secure key regeneration for enhanced covertness in quantum key distribution (QKD).

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Security
  • Quantum Cryptography

Background:

  • Covert communication aims to transmit information undetected by eavesdroppers.
  • Quantum communication offers enhanced security but extending covertness presents challenges.
  • Existing quantum key distribution (QKD) protocols may not inherently support covertness.

Purpose of the Study:

  • To demonstrate the feasibility of covert quantum communication over noisy optical channels.
  • To investigate the simultaneous achievement of positive key rates and covertness in QKD.
  • To develop a secure method for covert key regeneration in quantum communication systems.

Main Methods:

  • Utilizing single-photon and coherent-state encodings for qubit transmission.
  • Analyzing covert quantum communication in the presence of environmental and lab-induced noise.
  • Proposing and analyzing a hybrid protocol combining pseudorandom number generators (PRNGs) and covert QKD for key regeneration.

Main Results:

  • Demonstrated successful covert quantum communication over optical channels with noise.
  • Achieved simultaneous positive key rates and covertness in a QKD setting.
  • Showcased that covert QKD alone is insufficient for key regeneration, necessitating a hybrid approach.

Conclusions:

  • Covert quantum communication is achievable, even in noisy environments.
  • A hybrid protocol effectively addresses the challenge of covert key regeneration, ensuring security.
  • The proposed methods enhance the security and practicality of covert quantum communication and QKD.