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Relativistic quantum key distribution system with one-way quantum communication.
K S Kravtsov1,2, I V Radchenko3,4, S P Kulik3,5
1Quantum Technology Centre of Moscow State University, Moscow, Russia. ks.kravtsov@gmail.com.
Scientific Reports
|April 19, 2018
Summary
Unambiguous state discrimination (USD) poses a security risk in quantum key distribution (QKD). A new relativistic QKD system uses causality to prevent USD attacks, enhancing practical QKD security.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Quantum Communication Security
Background:
- Unambiguous state discrimination (USD) is a significant challenge for practical quantum key distribution (QKD).
- USD enables efficient eavesdropping in many QKD systems when channel loss exceeds a threshold.
- Current security analyses often lack comprehensive 'loss vs. BER' bounds for advanced protocols.
Purpose of the Study:
- To address the security vulnerabilities posed by unambiguous state discrimination in QKD.
- To develop a QKD system inherently immune to USD-based attacks.
- To demonstrate a practical and easily securable QKD system.
Main Methods:
- Development of a relativistic quantum key distribution (QKD) system.
- Leveraging the principle of causality for inherent security against USD attacks.
- Focus on a system design suitable for metropolitan line-of-sight arrangements.
Main Results:
- Demonstration of a relativistic QKD system.
- The system exhibits inherent immunity to unambiguous state discrimination attacks.
- The system is practical for metropolitan line-of-sight deployments.
Conclusions:
- The relativistic QKD system offers a robust solution to the USD problem.
- Its basic structure facilitates straightforward and comprehensive security analysis.
- This approach enhances the security and practicality of quantum key distribution.
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