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

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 puls...

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Bibliographic Details
Published inarXiv.org
Main Authors Matsuura, Takaya, Sasaki, Toshihiko, Koashi, Masato
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 08.02.2019
Subjects
Design of experiments
Leakage
Phase shift
Physics - Quantum Physics
Protocol
Quantum cryptography
Signal monitoring
Upper bounds
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1812.10916