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arXiv 0811.2050quant-phhep-th
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非对易系统中的量子纠缠

Quantum entanglement in a non-commutative system

S. Adhikari, B. Chakraborty, A. S. Majumdar, S. Vaidya

摘要:

我们研究了二维位置空间的非对易性对连续变量系统两体纠缠的影响。我们首先将研究交换系统高斯态纠缠的标准辛框架推广到二维非交换系统。利用二分态可分性的部分转置正判据,我们得到了一个依赖于非对易参数$θ$的非对易系统可分性的新条件。然后,我们考虑一个具体的例子,一个二分高斯态,并显示了定量减少纠缠起源于非交换动力学。我们表明,这种减少纠缠的非交换系统所产生的相空间变量(不确定性关系)的方差的修改是清楚地表现在两个粒子之间,是由小的距离分开。

英文摘要:

We explore the effect of two-dimensional position-space non-commutativity on the bipartite entanglement of continuous variable systems. We first extend the standard symplectic framework for studying entanglement of Gaussian states of commutative systems to the case of non-commutative systems residing in two dimensions. Using the positive partial transpose criterion for separability of bipartite states we derive a new condition on the separability of a non-commutative system that is dependent on the noncommutative parameter $θ$. We then consider the specific example of a bipartite Gaussian state and show the quantitative reduction of entanglement originating from non-commutative dynamics. We show that such a reduction of entanglement for a non-commutative system arising from the modification of the variances of the phase space variables (uncertainty relations) is clearly manifested between two particles that are separated by small distances.

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