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Paper detail

Local oscillator fluctuation opens a loophole for Eve in practical continuous-variable quantum-key-distribution systems

We consider the security of practical continuous-variable quantum key distribution implementation with the local oscillator (LO) fluctuating in time, which opens a loophole for Eve to intercept the secret key. We show that Eve can simulate this fluctuation to hide her Gaussian collective attack by reducing the intensity of the LO. Numerical simulations demonstrate that, if Bob does not monitor the LO intensity and does not scale his measurements with the instantaneous intensity values of LO, the secret key rate will be compromised severely.

preprint2014arXivOpen access
Xiang-Chun MaShi-Hai SunMu-Sheng JiangLin-Mei Liang
quant-ph
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Xiang-Chun MaShi-Hai SunMu-Sheng JiangLin-Mei Liang

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