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Remote Preparation of Three-Particle GHZ Class States

Communications in Theoretical Physics 2008年第2期49卷 359-364页

作者： LIU Yi-Min WANG Zhang-Yin LIU Jun ZHANG Zhan-Jun Department of Physics Shaoguan University Shaoguan 512005 China Key Laboratory of Optoelectronic Information Acquisition ＆ Manipulation of Ministry of Education of China School of Physics ＆ Material Science Anhui University Hefei 230039 China

We propose a remote state preparation （RSP） scheme of three-particle Greenberger Horne-Zeilinger （GHZ） class states, where quantum channels are composed of two maximally entangled states. With the aid of forward classical bits, the preparation of the original state can be successfully realized with the probability 1/2, the necessary classical communication cost is 0.5 bit on average. If the state to be prepared belongs to some special states, the success probability of preparation can achieve 1 after consuming one extra bit on average. We then generalize this scheme to the case that the quantum channels consist of two non-maximally entangled states.

关键词： remote state preparation entangled states classical communication cost two-qubit projective measurement unitary operation

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Assisted Cloning and Orthogonal Complementing of an Arbitrary Unknown two-qubit Entangled State

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Communications in Theoretical Physics 2006年第5X期46卷 849-852页

作者： FANG Ming LIU Yi-Min LIU Jun SHI Shou-Hua ZHANG Zhan-Jun School of Physics & Material Science Anhui University Hefei 230039 China Department of Physics Shaoguan University Shaoguan 512005 China The State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

Based on A.K. Pati＇s original idea [Phys. Rev. A 61 （2000） 022308] on single-qubit-state-assisted clone, very recently Zhan has proposed two assisted quantum cloning protocols of a special class of unknown two-qubit entangled states [Phys. Lett. A 336 （2005） 317]. In this paper we further generalize Zhan＇s protocols such that an arbitrary unknown two-qubit entangled state can be treated.

关键词： quantum cloning arbitrary two-qubit entangled state two-qubit projective measurement

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Assisted Cloning and Orthogonal Complementing of an Arbitrary Unknown two-qubit Entangled State

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Communications in Theoretical Physics 2006年第11期 849-852页

作者： FANG Ming,~1 LIU Yi-Min,~(2,3) LIU Jun,~1 SHI Shou-Hua,~1 and ZHANG Zhan-Jun~(1,3,+) 1 School of Physics & Material Science, Anhui University, Hefei 230039, China 2 Department of Physics, Shaoguan University, Shaoguan 512005, China 3 The State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, the Chinese Academy of Sciences, Wuhan 430071, China

Based on A.K. Pati’s original idea [Phys. Rev. A 61 (2000) 022308] on single-qubit-state-assisted clone, very recently Zhan has proposed two assisted quantum cloning protocols of a special class of unknown two-qubit entangled states [Phys. Lett. A 336 (2005) 317]. In this paper we further generalize Zhan’s protocols such that an arbitrary unknown two-qubit entangled state can be treated.

关键词： quantum cloning arbitrary two-qubit entangled state two-qubit projective measurement

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