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Spin Squeezing in Superposition of Four-Qubit Symmetric State and W States

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Abstract

We investigate the entanglement property of a four-qubit state superposed by a four-qubit GHZ state and a symmetric state with spin squeezing. Numerically and analytic solutions for spin squeezing parameters are given. The squeezed parameters depend on the superpose coefficients and the relative phases. It is shown that there is no spin squeezing at n 1 direction and it occurs at n 2 direction under some conditions.

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  1. Faculty of Science, Jiangxi University of Science and Technology, Ganzhou, 341000, People’s Republic of China

    Zhiyong Liu

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  1. Zhiyong Liu
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Correspondence to Zhiyong Liu.

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Liu, Z. Spin Squeezing in Superposition of Four-Qubit Symmetric State and W States. Int J Theor Phys 52, 820–826 (2013). https://doi.org/10.1007/s10773-012-1391-4

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  • DOI: https://doi.org/10.1007/s10773-012-1391-4

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