W-state Analyzer and Multi-party Measurement-device-independent Quantum Key Distribution

• Main Authors: Zhu, Changhua (Author), Xu, Feihu (Contributor), Pei, Changxing (Author)
• Other Authors: Massachusetts Institute of Technology. Research Laboratory of Electronics (Contributor)
• Format: Article
• Language: English
• Published: Nature Publishing Group, 2016-01-19T21:23:55Z.
• Subjects: Article
• Online Access: Get fulltext

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.
United States. Office of Naval Research
United States. Air Force Office of Scientific Research
National Natural Science Foundation (China) (61372076)
National Natural Science Foundation (China) (61301171)
National 111 Project of China (B08038)
China Scholarship Council (201308615037)