Optimal decoy intensity for decoy quantum key distribution

Abstract

In the decoy quantum key distribution, we show that a smaller decoy intensity gives a better key generation rate in the asymptotic setting when we employ only one decoy intensity and the vacuum pulse. In particular, the counting rate of single photon can be perfectly estimated when the decoy intensity is infinitesimal. The same property holds even when the intensities cannot be perfectly identified. Further, we propose a protocol to improve the key generation rate over the existing protocol under the same decoy intensity.

References in corpus (6)

• Long term performance of the SwissQuantum quantum key distribution network in a field environment
• Upper bounds of eavesdropper's performances in finite-length code with decoy method
• General theory of decoy-state quantum cryptography with source errors
• General theory for decoy-state quantum key distribution with arbitrary number of intensities
• Exact minimum and maximum of yield with a finite number of decoy light intensities
• Upper bounds for the secure key rate of decoy state quantum key distribution

Cited by in corpus (7)

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• Encoding-side-channel-free and measurement-device-independent quantum key distribution
• Finite-Block-Length Analysis in Classical and Quantum Information Theory
• Sending-or-not-sending quantum key distribution with phase postselection
• Overcoming Intensity Limits for Long-Distance Quantum Key Distribution
• Adaptive Techniques in Practical Quantum Key Distribution