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Revisiting the security of quantum dialogue and bidirectional quantum secure direct communication

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Science China(Physics,Mechanics & Astronomy) 2008年第5期51卷 559-566页

作者： GAO Fei guo fenzhuo WEN QiaoYan ZHU FuChen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Tele-communicationsBeijing 100876China School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China National Laboratory for Modern Communications Chengdu 610041China

From the perspective of information theory and cryptography,the security of two quantum dialogue protocols and a bidirectional quantum secure direct communi-cation(QSDC) protocol was analyzed,and it was pointed out that the transmitted information would be partly leaked out in *** is,any eavesdropper can elicit some information about the secrets from the public annunciations of the legal *** phenomenon should have been strictly forbidden in a quantum secure *** fact,this problem exists in quite a few recent proposals and,therefore,it deserves more research attention in the following related study.

关键词： quantum secure direct communication quantum dialogue quantum cryptography cryptanalysis

Comparing the efficiencies of different detect strategies in the ping-pong protocol

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Science China(Physics,Mechanics & Astronomy) 2008年第12期51卷 1853-1860页

作者： GAO Fei guo fenzhuo WEN QiaoYan ZHU FuChen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Tele-communicationsBeijing 100876China School of Sciences Beijing University of Posts and TelecommunicationsBeijing 100876China National Laboratory for Modern Communications Chengdu 610041China

The way to compare the efficiencies of different detect strategies (DSs) in the "ping-pong" protocol is studied. The trade-off between information gain and dis- turbance is calculated and compared for different DSs. The comparison result primely tallies with our intuitional analysis. It is shown that the analysis of this trade-off is a feasible way to compare the performances of different DSs in theory.

关键词： quantum key distribution quantum cryptography quantum secure direct communication

Genuine Einstein-Podolsky-Rosen steering of generalized three-qubit states via unsharp measurements

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Chinese Physics B 2023年第4期32卷 215-225页

作者：陈玉玉郭奋卓魏士慧温巧燕 School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China Henan Key Laboratory of Network Cryptography Technology Zhengzhou 450001China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China CETC Cyberspace Security Technology Co. Ltd.Beijing 100041China

We aim to explore all possible scenarios of(1→2)(where one wing is untrusted and the others two wings are trusted)and(2→1)(where two wings are untrusted,and one wing is trusted)genuine tripartite Einstein-Podolsky-Rosen(EPR)*** generalized Greenberger-Horne-Zeilinger(GHZ)state is shared between three spatially separated parties,Alice,Bob and *** both(1→2)and(2→1),we discuss the untrusted party and trusted party performing a sequence of unsharp measurements,*** each scenario,we deduce an upper bound on the number of sequential observers who can demonstrate genuine EPR steering through the quantum violation of tripartite steering *** results show that the maximum number of observers for the generalized GHZ states can be the same with that of the maximally GHZ state in a certain range of state ***,both the sharpness parameters range and the state parameters range in the scenario of(1→2)steering are larger than those in the scenario of(2→1)steering.

关键词： quantum information quantum steering generalized Greenberger-Horne-Zeilinger(GHZ)state