Measurement-device-independent Quantum Key Distribution with Inaccurate Coherent Sources

Measurement-device-independent' quantum key distribution is proposed to fight against all possible side channel detector attacks. The security of the original proposal relies on the assumption that the legitimate users can character their sources exactly, which might not be satisfied in practice. Here we propose a measurement-device-independent quantum key distribution protocol with inaccurate coherent sources. The assumption is that legitimate users only have the knowledge that sources, for encoding, are coherent sources, while the accuracy of the encoding operation can not be controlled exactly. We give the security proofs for it under collective attacks, and simulation results of the security bound are also presented by employing parameters of current quantum key distribution experiments.