title: Efficient multiuser quantum cryptography network based on entanglement.
abstract: We present an efficient quantum key distribution protocol with a certain entangled state to solve a special cryptographic task. Also, we provide a proof of security of this protocol by generalizing the proof of modified of Lo-Chau scheme. Based on this two-user scheme, a quantum cryptography network protocol is proposed without any quantum memory.
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.|State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Xue
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: Kunkun
authors.initials: K
authors.lastname: Wang
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Wang