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Improved security bound for the round-robin-differential-phase-shift quantum key distribution

Yin, Zhen-Qiang, Wang, Shuang, Chen, Wei, Han, Yun-Guang, Wang, Rong, Guo, Guang-Can, Han, Zheng-Fu·2018·Nature Communications
DOI 10.1038/s41467-017-02211-xPMC PMC5792628
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Abstract

The round-robin-differential-phase-shift (RRDPS) quantum key distribution (QKD) protocol has attracted intensive study due to its distinct security characteristics; e.g., information leakage is bounded without learning the error rate of key bits. Nevertheless, its practicality and performance are still not satisfactory. Here, by observing the phase randomization of the encoding states and its connection with eavesdropper’s attack, we develop an improved bound on information leakage. Interestingly, our theory is especially useful for implementations with short trains of pulses, and running without monitoring signal disturbance is still available. As a result, the practicality and performance of RRDPS are improved. Furthermore, we realize a proof-of-principle experiment with up to 140 km of fiber, which has been the longest achievable distance of RRDPS until now, whereas the original theory predicted that no secret key could be generated in our experiment. Our results will help in bringing practical RRDPS closer to practical implementations.

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Metadata

Authors
Yin, Z.-Q., Wang, S., Chen, W., Han, Y.-G., Wang, R., Guo, G.-C., & Han, Z.-F.
Venue
Nature Communications
Publisher
Springer Science and Business Media LLC
Published
2018-01-31
Volume
9
Issue
1
ISSN
2041-1723
DOI
10.1038/s41467-017-02211-x
PMC
PMC5792628
Cited by
59
References
0
Language
en
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