title: Differential-phase-shift quantum key distribution using heralded narrow-band single photons.
abstract: We demonstrate the first proof of principle differential phase shift (DPS) quantum key distribution (QKD) using narrow-band heralded single photons with amplitude-phase modulations. In the 3-pulse case, we obtain a quantum bit error rate (QBER) as low as 3.06% which meets the unconditional security requirement. As we increase the pulse number up to 15, the key creation efficiency approaches 93.4%, but with a cost of increasing the QBER. Our result suggests that narrow-band single photons maybe a promising source for the DPS-QKD protocol.
authors.affiliation: Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Chang
authors.initials: C
authors.lastname: Liu
authors.forename: Shanchao
authors.initials: S
authors.lastname: Zhang
authors.forename: Luwei
authors.initials: L
authors.lastname: Zhao
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.forename: C-H F
authors.initials: CH
authors.lastname: Fung
authors.forename: H F
authors.initials: HF
authors.lastname: Chau
authors.forename: M M T
authors.initials: MM
authors.lastname: Loy
authors.forename: Shengwang
authors.initials: S
authors.lastname: Du
mesh_terms: D016494:Computer Security; D003198:Computer Simulation; D008962:Models, Theoretical; D017785:Photons; D011789:Quantum Theory; D012815:Signal Processing, Computer-Assisted