Measurement-device-independent quantum communication with an untrusted source
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Measurement-device-independent quantum key distribution (MDI-QKD) can provide enhanced security compared to traditional QKD, and it constitutes an important framework for a quantum network with an untrusted network server. Still, a key assumption in MDI-QKD is that the sources are trusted. We propose here a MDI quantum network with a single untrusted source. We have derived a complete proof of the unconditional security of MDI-QKD with an untrusted source. Using simulations, we have considered various real-life imperfections in its implementation, and the simulation results show that MDI-QKD with an untrusted source provides a key generation rate that is close to the rate of initial MDI-QKD in the asymptotic setting. Our work proves the feasibility of the realization of a quantum network. The network users need only low-cost modulation devices, and they can share both an expensive detector and a complicated laser provided by an untrusted network server.
DepartmentMassachusetts Institute of Technology. Research Laboratory of Electronics
Physical Review A
American Physical Society
Xu, Feihu. "Measurement-device-independent quantum communication with an untrusted source." Phys. Rev. A 92, 012333 (July 2015). © 2015 American Physical Society
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