Universally-composable finite-key analysis for efficient four-intensity decoy-state quantum key distribution

Abstract

We propose an efficient four-intensity decoy-state BB84 protocol and derive concise security bounds for this protocol with the universally composable finite-key analysis method. Comparing with the efficient three-intensity protocol, we find that our efficient four-intensity protocol can increase the secret key rate by at least $30\%$. Particularly, this increasing rate of secret key rate will be raised as the transmission distance increases. At a large transmission distance, our efficient four-intensity protocol can improve the performance of quantum key distribution profoundly.

accepted by Eur. Phys. J. D

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Cited by in corpus (2)

• Experimental composable security decoy-state quantum key distribution using time-phase encoding
• Experimental 4-intensity decoy-state quantum key distribution with asymmetric basis detector efficiency