Yurke-like态的自旋压缩

Spin squeezing of Yurke-like state

利用自旋压缩研究了Yurke-like态的纠缠特性。Yurke-like态可以看成是一个对称量子态和两个特殊多粒子态的相干叠加,因此可以通过研究叠加系数和相对相位对自旋压缩参数的影响来研究Yurke-like态的纠缠特性;利用求极值的办法得到了最佳压缩方向角和最佳压缩值的解析表达式。结果表明:自旋压缩参数随叠加系数单调变化而随相对相位作周期性改变;粒子数越多,压缩程度越高。

The entangled property of Yurke-like state was investigated via spin squeezing. Since the Yurke- like state is superposed by a symmetric state and two special multi-particle states, the entangled property can be studied by investigating superposition coefficient and relative phase＇s influence on spin squeezing parameter. The analytical results for the optimal squeezed direction and optimal squeezing were obtained via extremum method. It＇s shown that the spin squeezing parameter monotonously changes with superposition coefficients and periodically changes with relative phase. It is also shown that the more the number of the particles is, the stronger the degree of squeezing will be.