Classical Communication and Entanglement Cost in Preparing a Class of Multi-qubit States |
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| Authors: | PAN Gui-Xia LIU Yi-Min ZHANG Zhan-Jun |
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| Affiliation: | 1. Department of Mathematics and Physics,Anhui University of Science and Technology, Huainan 232001, China;2. Department of Physics, Shaoguan University, Shaoguan 512005, China;3. Key Laboratory of Optoelectronic Information Acquisition & Manipulation of Ministry of Education of China, School of Physics & Material Science, Anhui University, Hefei 230039, China |
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| Abstract: | Recently, several similar protocols [J. Opt. B 4 (2002) 380; Phys. Lett. A 316 (2003) 159; Phys. Lett. A355 (2006) 285; Phys. Lett. A 336 (2005) 317] for remotelypreparing a class of multi-qubit states (i.e, α|0 … 0〉+β|1 … 1〉) were proposed, respectively. In this paper, by applying the controlled-not (CNOT) gate, a new simple protocol is proposed for remotely preparing such class ofstates. Compared to the previous protocols, both classicalcommunication cost and required quantum entanglement in our protocol are remarkably reduced. Moreover, the difficulty of identifying some quantum states in our protocol is also degraded.Hence our protocol is more economical and feasible. |
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| Keywords: | remote state preparation quantum entanglement classical communication cost projective measurement local unitary operation |
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