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deterministic quantum key distribution with Pulsed Homodyne Detection

Communications in Theoretical Physics 2010年第1期53卷 67-70页

作者：王川王婉莹艾清龙桂鲁 School of Science and key Laboratory of Optical Communication and Lightwave Technologies Beijing University of Posts and Telecommunications key laboratory of Atomic and Molecular NanoSciences and Department of Physics Tsinghua University Tsinghua National Laboratory of Information Science and Technology

In this paper, we propose a deterministic quantum communication protocol using weak coherent states and pulsed homodyne detection. In this protocol, the communication parties exchange their secret information deterministicaJly in two rounds. The devices and efficiency of the protocol are discussed respectively. We also show the security of the protocol against intercept-resend and Trojan-Horse eavesdropping attacks.

关键词： deterministic quantum key distribution pulsed homodyne detection

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Controlling the key by choosing the detection bits in quantum cryptographic protocols

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Science China(Information Sciences) 2015年第11期58卷 200-210页

作者： LIU Bin GAO Fei HUANG Wei LI Dan WEN QiaoYan State key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications College of Computer Science Chongqing University

Eavesdropping detection is an indispensable process of most quantum cryptographic protocols. By publishing and comparing part of the shared bits, called as detection bits, the participants can check whether there exists an eavesdropper. Generally, the detection bits are chosen randomly. Consequently, the secret bits, i.e., the rest bits, are also random. Then, what if the detection bits are chosen non-randomly? Can the participant who chooses the detection bits make the secret bits to be a predetermined string he expected?This paper focuses on the participants’ key control capability when they choose the detection bits selectively in two-party quantum communication protocols. Concretely, we analyze the participants’ key control capability in different situations of different proportions of the detection bits. And we prove that the participants can predetermine, with high probability, any part of the secret bits of which the length is smaller than that of the detection bits. The above result has various potential applications in quantum cryptographic ***, utilizing this non-random selection of the detection bits, one can realize the function of a deterministic quantum key distribution protocol through a random one if the number of the detection bits is not smaller than that of the secret bits. What is more, we find that quite a few quantum key agreement protocols cannot guarantee the fairness of the key in the sense that the participant who chooses the detection bits can control the key somewhat.

关键词： eavesdropping detection deterministic quantum key distribution quantum key agreement quantum information quantum cryptography

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