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Cryptanalysis and Improvement of a Quantum Secret Sharing Protocol between Multiparty and Multiparty with Single Photons and unitary transformations

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Chinese Physics Letters 2010年第6期27卷 13-15页

作者： ZHU Zhen-Chao ZHANG Yu-Qing Key Lab of Computer Networks and Information Security of Ministry of Education Xidian University Xi'an 710071 National Computer Network Intrusion Protection Center Graduate University Chinese Academy of Sciences Beijing 100049

In a recent paper [Chin. Phys. Lett 25（2008）1187], a quantum secret sharing scheme between multiparty and multiparty was presented. We show that the protocol is not secure because the last member in Alice＇s group can illegally obtain most secret messages without introducing any error. Finally, a possible way to avoid the security flaw is suggested.

关键词： CRYPTOGRAPHY QUANTUM communication unitary transformations ERROR analysis (Mathematics) SECURITY systems

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Probabilistic teleportation of multi-particle partially entangled state

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Chinese Physics B 2008年第3期17卷 771-777页

作者：陈秀波杜建忠温巧燕朱甫臣 State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications School of Science Beijing University of Posts and Telecommunications School of Information Engineering Beijing University of Science and Technology National Laboratory for Modern Communications

Utilizing the generalized measurement described by positive operator-wlued measure, this paper comes up with a protocol for teleportation of an unknown multi-particle entangled （GHZ） state with a certain probability. The feature of the present protocol is to weaken requirement for the quantum channel initially shared by sender and receiver. All unitary transformations performed by receiver are summarized into a formula. On the other hand, this paper explicitly constructs the efficient quantum circuits for implementing the proposed teleportation by means of universal quantum logic operations in quantum computation.

关键词： quantum teleportation quantum circuits positive operator-valued measure unitary transformations

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Deterministic and exact entanglement teleportation via the W state

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Chinese Physics B 2010年第1期19卷 41-45页

作者：陈秀波温巧燕孙中旭上官丽英杨义先 State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Key Laboratory of Network and Information Attack and Defence Technology of Ministry of Education Beijing University of Posts and Telecommunications National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Water Supply Company of Daqing Petroleum Administration

Utilizing a three-particle W state, we come up with a protocol for the teleportation of an unknown two-particle entangled state. It is shown that the teleportation can be deterministically and exactly realized. Moreover, two-particle entanglement teleportation is generalized to a system consisting of many particles via a three-particle W state and a multi-particle W state, respectively. All unitary transformations performed by the receiver are given in a concise formula.

关键词： quantum teleportation W state unitary transformations

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