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Detector-device-independent quantum secret sharing with source flaws.

Xiuqing Yang1, Kejin Wei2, Haiqiang Ma3

  • 1College of Science, Inner Mongolia University of Technology, Hohhot, 010051, China.

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|April 12, 2018
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Summary
This summary is machine-generated.

We propose a quantum secret sharing protocol using measurement-device-independent entanglement witness (MDI-EW) to securely share keys over 136km, even with untrusted devices and source flaws.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Communication

Background:

  • Entanglement witness (EW) is crucial for detecting entanglement with untrusted devices.
  • Quantum secret sharing (QSS) protocols are vulnerable to detector side-channel attacks.
  • Existing QSS protocols often assume perfect sources, limiting practical application.

Purpose of the Study:

  • To propose a robust quantum secret sharing (QSS) protocol resistant to detector side-channel attacks.
  • To develop a QSS protocol that accommodates source flaws in practical systems.
  • To ensure secure key distribution between Alice and Bob over long distances, even with a dishonest participant (Charlie).

Main Methods:

  • Utilizing the measurement-device-independent entanglement witness (MDI-EW) to detect entanglement.
  • Implementing a double blinding-attack scenario to test protocol security.
  • Analyzing security against external eavesdroppers and dishonest participants using tight bounds for collective attacks.

Main Results:

  • A novel QSS protocol is proposed based on the MDI-EW method, effective against all detector side-channels.
  • The protocol allows for secure key distribution with source flaws, enabling long-distance communication.
  • Numerical simulations demonstrate secure QSS over 136 km using a single-photon source.

Conclusions:

  • The proposed MDI-EW based QSS protocol offers enhanced security against detector side-channels and source flaws.
  • The protocol ensures a secure key rate against both external eavesdroppers and dishonest participants.
  • Practical long-distance quantum secret sharing is achievable with current single-photon source technology.