Device calibration impacts security of quantum key distribution.

  title={Device calibration impacts security of quantum key distribution.},
  author={Nitin Jain and Christoffer Wittmann and Lars Lydersen and Carlos Wiechers and Dominique Elser and Christoph Marquardt and Vadim Makarov and Gerd Leuchs},
  journal={Physical review letters},
  volume={107 11},
Characterizing the physical channel and calibrating the cryptosystem hardware are prerequisites for establishing a quantum channel for quantum key distribution (QKD). Moreover, an inappropriately implemented calibration routine can open a fatal security loophole. We propose and experimentally demonstrate a method to induce a large temporal detector efficiency mismatch in a commercial QKD system by deceiving a channel length calibration routine. We then devise an optimal and realistic strategy… 

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