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

Xiang-Chun Ma; Shi-Hai Sun; Mu-Sheng Jiang; Lin-Mei Liang

doi:10.1103/PhysRevA.88.022339

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

Quantum Physics 2014-03-04 v2

Authors: Xiang-Chun Ma , Shi-Hai Sun , Mu-Sheng Jiang , Lin-Mei Liang

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Abstract

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.

Cite

@article{arxiv.1303.6043,
  title  = {Local oscillator fluctuation opens a loophole for Eve in practical continuous-variable quantum-key-distribution systems},
  author = {Xiang-Chun Ma and Shi-Hai Sun and Mu-Sheng Jiang and Lin-Mei Liang},
  journal= {arXiv preprint arXiv:1303.6043},
  year   = {2014}
}

Comments

8 pages, 5 figures

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