title: W-state Analyzer and Multi-party Measurement-device-independent Quantum Key Distribution.
abstract: W-state is an important resource for many quantum information processing tasks. In this paper, we for the first time propose a multi-party measurement-device-independent quantum key distribution (MDI-QKD) protocol based on W-state. With linear optics, we design a W-state analyzer in order to distinguish the four-qubit W-state. This analyzer constructs the measurement device for four-party MDI-QKD. Moreover, we derived a complete security proof of the four-party MDI-QKD, and performed a numerical simulation to study its performance. The results show that four-party MDI-QKD is feasible over 150 km standard telecom fiber with off-the-shelf single photon detectors. This work takes an important step towards multi-party quantum communication and a quantum network.
authors.affiliation: State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an, Shaanxi 710071, China.|Department of Electrical &Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Changhua
authors.initials: C
authors.lastname: Zhu
authors.affiliation: Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Feihu
authors.initials: F
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an, Shaanxi 710071, China.
authors.forename: Changxing
authors.initials: C
authors.lastname: Pei