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Spin Squeezing and Quantum Fisher Information for Mixed Hamiltonian Model

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Abstract

We investigate spin squeezing and the mean quantum Fisher information per particle χ 2 for mixed Hamiltonian model. By adopting frozen-spin approximation, we first derive a analytical expression of spin squeezing parameter ξ 2 and then numerically calculate ξ 2 and χ 2. It is shown that most of the time the spin squeezing appears alternatively in the x and y directions, but it cannot appear simultaneously in the two directions. It is also shown that the smaller external field strength induces better entanglement and larger period.

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Authors and Affiliations

  1. Department of Physics, Nanchang Normal University, Nanchang, 330032, People’s Republic of China

    Guo-Jin Hu

  2. Department of Physics, Jiangxi Agricultural University, Nanchang, 330032, People’s Republic of China

    Xiu-Xia Hu

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  1. Guo-Jin Hu
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  2. Xiu-Xia Hu
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Correspondence to Guo-Jin Hu.

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Hu, GJ., Hu, XX. Spin Squeezing and Quantum Fisher Information for Mixed Hamiltonian Model. Int J Theor Phys 53, 533–537 (2014). https://doi.org/10.1007/s10773-013-1837-3

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  • DOI: https://doi.org/10.1007/s10773-013-1837-3

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