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Measurement-device-independent quantum key distribution with leaky sources
Weilong Wang1,2,3, Kiyoshi Tamaki4, Marcos Curty5
1EI Telecomunicación, Department of Signal Theory and Communications, University of Vigo, 36310, Vigo, Spain. wwang@com.uvigo.es.
Scientific Reports
|January 19, 2021
Summary
This study develops a new method to prove the security of measurement-device-independent quantum key distribution (MDI-QKD) even with imperfect transmitters. It shows MDI-QKD is secure with leaky sources, offering practical guidance for quantum communication security.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Quantum Communication Systems
Background:
- Measurement-device-independent quantum key distribution (MDI-QKD) eliminates detection side-channel vulnerabilities.
- Current MDI-QKD security proofs rely on strict assumptions about non-leaky transmitters, which are difficult to achieve in practice.
Purpose of the Study:
- To develop a general formalism for proving MDI-QKD security with leaky sources.
- To analyze the finite-key security and robustness of prominent MDI-QKD protocols against transmitter information leakage.
Main Methods:
- Developed a novel theoretical framework to address information leakage from quantum sources.
- Analyzed two specific MDI-QKD protocols: a three-intensity and a four-intensity decoy-state scheme.
- Evaluated security against leakage from both intensity and phase modulators.
Main Results:
- Demonstrated that MDI-QKD remains secure even when transmitters leak information.
- Quantified the robustness of decoy-state MDI-QKD protocols against specific types of leakage.
- Established feasibility of MDI-QKD within practical timeframes with sufficiently isolated sources.
Conclusions:
- MDI-QKD can be secured against practical transmitter imperfections.
- The developed formalism provides a crucial reference for secure MDI-QKD implementation.
- This research enhances the practical security of quantum communication systems.
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