Refined security proof of the round-robin differential phase shift quantum key distribution and its improved performance in the finite-sized case

Abstract

Among many quantum key distribution (QKD) protocols, the round-robin differential phase shift (RRDPS) protocol is unique in that it can upper-bound the amount of the information leakage without monitoring the signal disturbance. To expedite implementation of the protocol, however, the number of pulses forming a single block should be kept small, which significantly decreases the key rates in the original security proof. In the present paper, we refine the security proof of the RRDPS protocol in the finite-sized regime and achieve a tighter estimation for the information leakage without changing the original experimental setups. As a consequence, we obtain better key rates in both asymptotic and finite-sized cases while keeping the preferable features of the protocol, such as omission of phase randomization.

25 pages, 5 figures

References in corpus (6)

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Cited by in corpus (6)

• Finite-size security of continuous-variable quantum key distribution with digital signal processing
• Finite-key security analysis of differential-phase-shift quantum key distribution
• Security of round-robin differential-phase-shift quantum key distribution protocol with correlated light sources
• Refined finite-size analysis of binary-modulation continuous-variable quantum key distribution
• Continuous-variable quantum digital signatures that can withstand coherent attacks
• High-dimensional Encoding in the Round-Robin Differential-Phase-Shift Protocol