Security of distributed-phase-reference quantum key distribution

Abstract

Distributed-phase-reference quantum key distribution stands out for its easy implementation with present day technology. Since many years, a full security proof of these schemes in a realistic setting has been elusive. For the first time, we solve this long standing problem and present a generic method to prove the security of such protocols against general attacks. To illustrate our result we provide lower bounds on the key generation rate of a variant of the coherent-one-way quantum key distribution protocol. In contrast to standard predictions, it appears to scale quadratically with the system transmittance.

4 pages + appendix, 4 figures

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• Differential-phase-shift quantum key distribution protocol with small number of random delays
• Upper security bounds for coherent-one-way quantum key distribution
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• Simple security proof of coherent-one-way quantum key distribution
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• Practical quantum key distribution with non-phase-randomized coherent states
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• Foiling zero-error attacks against coherent-one-way quantum key distribution
• Hacking coherent-one-way quantum key distribution with present-day technology
• Implementation of a hybrid scheme for coherent plug-and-play quantum key distribution
• High-Fidelity Coherent-One-Way QKD Simulation Framework for 6G Networks: Bridging Theory and Reality
• Quantum counterfactuality with identical particles
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