title: Experimental quantum-key distribution with an untrusted source.
abstract: The photon statistics of a quantum-key-distribution (QKD) source are crucial for security analysis. We propose a practical method, with only a beam splitter and a photodetector, to monitor the photon statistics of a QKD source. By implementing in a plug and play QKD system, we show that the method is highly practical. The final secure key rate is 52 bit/s, compared to 78 bit/s when the source is treated as a trusted source.
authors.affiliation: CREAM Group, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Peng
authors.forename: Hao
authors.initials: H
authors.lastname: Jiang
authors.forename: Bingjie
authors.initials: B
authors.lastname: Xu
authors.forename: Xiongfeng
authors.initials: X
authors.lastname: Ma
authors.forename: Hong
authors.initials: H
authors.lastname: Guo