title: Experimental demonstration of polarization encoding measurement-device-independent quantum key distribution.
abstract: We demonstrate the first implementation of polarization encoding measurement-device-independent quantum key distribution (MDI-QKD), which is immune to all detector side-channel attacks. Active phase randomization of each individual pulse is implemented to protect against attacks on imperfect sources. By optimizing the parameters in the decoy state protocol, we show that it is feasible to implement polarization encoding MDI-QKD with commercial off-the-shelf devices. A rigorous finite key analysis is applied to estimate the secure key rate. Our work paves the way for the realization of a MDI-QKD network, in which the users only need compact and low-cost state-preparation devices and can share complicated and expensive detectors provided by an untrusted network server.
authors.affiliation: Centre for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Tang
authors.affiliation: Centre for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
authors.forename: Zhongfa
authors.initials: Z
authors.lastname: Liao
authors.affiliation: Centre for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
authors.forename: Feihu
authors.initials: F
authors.lastname: Xu
authors.affiliation: Centre for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
authors.forename: Bing
authors.initials: B
authors.lastname: Qi
authors.affiliation: Centre for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
authors.forename: Li
authors.initials: L
authors.lastname: Qian
authors.affiliation: Centre for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G4.
authors.forename: Hoi-Kwong
authors.initials: HK
authors.lastname: Lo