Global and Local Spin Squeezing in Coupled Quantum Kicked Tops Model |
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Authors: | Dong Yan Lijun Song Jian Ma and Xiaoguang Wang |
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Institution: | 1.School of Science,Changchun University,Changchun,P.R. China;2.College of Physics,Jilin University,Changchun,P.R. China;3.Zhejiang Institute of Modern Physics, Department of Physics,Zhejiang University,HangZhou,P.R. China |
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Abstract: | We investigate the global and the local spin squeezing in a weakly coupled quantum kicked tops system. Two different situations
are considered: (i) N=1 and (ii) N=30 for each subsystem, corresponding to quantum and classical cases, respectively. In the first case, since the two subsystems
have no spin squeezing, the global squeezing completely originates from quantum correlations. For the second one, the global
spin squeezing is enhanced over the local one. Due to the chaotic nature of the system, the spin squeezing is sensitive to
the initial state. In chaotic region, the squeezing vanished time is much shorter than that in the regular region. |
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