10 February 2017 Round-robin differential-phase-shift quantum key distribution in wavelength-multiplexed fiber channel
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Proceedings Volume 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016); 102502F (2017) https://doi.org/10.1117/12.2267279
Event: Fourth International Conference on Optical and Photonics Engineering, 2016, Chengdu, China
Abstract
Realizing long-distance quantum key distribution (QKD) in fiber channel where classical optical communications and quantum signals are multiplexed by their different wavelengths has attracted considerable attentions. The achievable secure distance of commonly-used Bennet-Brassard 1984 (BB84) protocol is lowered severely due to inevitable crosstalk from classical optical pulses. Unlike conventional quantum key distribution (QKD) protocols, round-robin differential-phase-shift (RRDPS) QKD protocol has a high tolerance for noise, since the potential information leakage in this protocol can be bounded without monitoring signal disturbance. Thus, it may be a promising protocol under noisy channel. In this work, we investigate the performance, e.g., achievable secure distance of RRPDS protocol, when crosstalk from classical communication is considered. Surprisingly, we find that RRPDS only has quite limited advantage over BB84 protocol when optical misalignment of QKD system is serious. If misalignment is trivial, BB84 can even outperform RRDPS protocol.
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Bingpeng Li, Bingpeng Li, } "Round-robin differential-phase-shift quantum key distribution in wavelength-multiplexed fiber channel", Proc. SPIE 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016), 102502F (10 February 2017); doi: 10.1117/12.2267279; https://doi.org/10.1117/12.2267279
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