Long distance measurement-device-independent quantum key distribution with entangled photon sources

DOI PDF 2 Citations
  • Feihu Xu
    Centre for Quantum Information and Quantum Control, Departments of Physics and Electrical & Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
  • Bing Qi
    Centre for Quantum Information and Quantum Control, Departments of Physics and Electrical & Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
  • Zhongfa Liao
    Centre for Quantum Information and Quantum Control, Departments of Physics and Electrical & Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
  • Hoi-Kwong Lo
    Centre for Quantum Information and Quantum Control, Departments of Physics and Electrical & Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada

Description

<jats:p>We present a feasible method that can make quantum key distribution (QKD), both ultra-long-distance and immune, to all attacks in the detection system. This method is called measurement-device-independent QKD (MDI-QKD) with entangled photon sources in the middle. By proposing a model and simulating a QKD experiment, we find that MDI-QKD with one entangled photon source can tolerate 77 dB loss (367 km standard fiber) in the asymptotic limit and 60 dB loss (286 km standard fiber) in the finite-key case with state-of-the-art detectors. Our general model can also be applied to other non-QKD experiments involving entanglement and Bell state measurements.</jats:p>

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