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arXiv 1107.1397quant-phmath-phmath.MP
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最大纠缠双量子比特相空间中的孤子

Solitons in Maximally Entangled Two Qubit Phase Space

Oktay Pashaev, Zeynep Nilhan Gurkan

摘要:

受复平面中广义圆下对称点的莫比乌斯变换的启发,引入了对应于对跖量子比特态的对称自旋相干态系统.这意味着最大纠缠自旋相干态基,在极限情况下,它减少到贝尔基。我们的对称镜像相干态的一个特殊性质是,对于复平面上的任何$ψ$值,它们都不会变得不纠缠。通过约化密度矩阵和并发行列式方法,证明了我们的基是最大纠缠的。此外,我们发现在这些状态中的自旋算符的平均值为零,因为它必须根据另一个完全纠缠态的操作定义。在此基础上计算了普适的单量子比特和双量子比特门,并导出了一些自旋系统的这些态的时间演化。我们发现,XYZ模型在两量子比特情形(H的Q符号)的平均能量呈现出规则的有限能量局域结构,并具有特征极值点,在最大纠缠的两量子比特相空间中表现为孤立子。推广到三个和更高的量子比特状态进行了讨论。

英文摘要:

Motivated by Möbius transformation for symmetrical points under the generalized circle in complex plane, the system of symmetrical spin coherent states corresponding to antipodal qubit states is introduced. It implies the maximally entangled spin coherent states basis, which in the limiting cases reduces to the Bell basis. A specific property of our symmetric image coherent states is that they never become unentangled for any value of $ψ$ from complex plane. By the reduced density matrix and the concurrence determinant methods, it is shown that our basis is maximally entangled. In addition we find that the average of spin operators in these states vanish, as it must be according to another, operational definition of completely entangled states. Universal one qubit and two qubit gates in this new basis are calculated and time evolution of these states for some spin systems is derived. We find that the average energy for XYZ model in two qubit case (Q symbol of H) shows regular finite energy localized structure with characteristic extremum points, and appears as a soliton in maximally entangled two qubit phase space. Generalizations to three and higher qubit states are discussed.

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