Spin Squeezing in Superposition of Four-Qubit Symmetric State and W States
Spin Squeezing in Superposition of Four-Qubit Symmetric State and W States
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DOI：
10.1007/s10773-012-1391-4
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发表时间：
2013-03
影响因子：
1.4
通讯作者：
Zhiyong Liu
中科院分区：
文献类型：
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作者：
Zhiyong Liu
研究了由四量子位GHZ态和具有自旋压缩的对称态叠加而成的四量子位态的纠缠特性。给出了自旋压缩参数的数值解和解析解。压缩参数依赖于叠加系数和相对位相。结果表明，在一定条件下，在1个方向上不存在自旋压缩，而在2个方向上存在自旋压缩。
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 atn1direction and it occurs atn2direction under some conditions.