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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum key distribution with correlated sources.

Margarida Pereira1, Go Kato2, Akihiro Mizutani3

  • 1Escuela de Ingeniería de Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vigo E-36310, Spain. mpereira@com.uvigo.es tamaki@eng.u-toyama.ac.jp.

Science Advances
|September 12, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to prove the security of quantum key distribution (QKD) even with correlated pulses. This advances practical QKD security for real-world devices.

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Area of Science:

  • Quantum Information Science
  • Cryptography
  • Applied Physics

Background:

  • Quantum key distribution (QKD) promises information-theoretic security but faces practical challenges.
  • Real-world QKD devices deviate from theoretical assumptions, compromising security.
  • Addressing pulse correlations is a critical, yet unsolved, problem in QKD security.

Purpose of the Study:

  • To develop a general method for proving QKD security with arbitrary long-range pulse correlations.
  • To bridge the gap between theoretical security proofs and practical QKD implementations.
  • To introduce a novel framework for QKD security proofs.

Main Methods:

  • Introduced a simple, general method to analyze QKD security under pulse correlations.
  • Developed a new security proof framework termed the 'reference technique'.
  • Ensured compatibility with existing security proofs for other device imperfections.

Main Results:

  • Successfully closed the gap in QKD security proofs concerning pulse correlations.
  • The proposed method accommodates arbitrarily long-range correlations.
  • The reference technique framework encompasses existing security proofs as special cases.

Conclusions:

  • The new method enables robust security proofs for QKD with flawed devices.
  • The reference technique offers a versatile framework applicable to various QKD protocols.
  • This work paves the way for achieving practical implementation security in QKD.