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Improving quantum state transfer in a general XY chain via the Dzyaloshinskyben Moriya interaction
Authors:Zhang Jian  Shao Bin  Zou Jian and Li Qian-Shu
Institution:Department of Chemistry, School of Sciences, Beijing Institute of Technology, Beijing 100081, China;Key Laboratory of Cluster Science of Ministry of Education and Department of Physics, School of Sciences, Beijing Institute of Technology, Beijing 100081, China;Key Laboratory of Cluster Science of Ministry of Education and Department of Physics, School of Sciences, Beijing Institute of Technology, Beijing 100081, China;Institute of Chemical Physics, Beijing Institute of Technology, Beijing 100081, China
Abstract:We study the state transfer of Bell states in a general XY spin chain using the Dzyaloshinsky-Moriya interaction. Two symmetries of fidelity with the anisotropy parameter are found. The maximum fidelity is shown to be significantly enhanced in cases of an odd number of sites. Enhancement of fidelity on a singlet state is greater than that on the other Bell states in such cases.
Keywords:state transfer  XY spin chain  Dzyaloshinsky-Moriya interaction
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