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arXiv quant-ph/0701053quant-phcond-mat.other
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自旋系统中的工程关联与纠缠动力学

Engineering correlation and entanglement dynamics in spin systems

T. S. Cubitt, J. I. Cirac

摘要:

我们表明,自旋系统的关联和纠缠动力学可以理解的自旋波的传播。这给出了一个简单的,物理解释的行为中看到的一些最近的作品,其中一个本地化的,低能量的激发被创建并允许演变。但它也扩展到在远离平衡状态下的非线性不变系统的场景,这需要较少的局部控制来准备。自旋波的演化完全取决于系统的色散关系,而色散关系通常取决于少量的外部物理参数。因此,这种新的洞察力相关动力学开辟了可能性,不仅预测,而且控制的传播速度和色散率,通过操纵这些参数。我们在一个简单的示例系统中分析性地证明了这一点。

英文摘要:

We show that the correlation and entanglement dynamics of spin systems can be understood in terms of propagation of spin waves. This gives a simple, physical explanation of the behaviour seen in a number of recent works, in which a localised, low-energy excitation is created and allowed to evolve. But it also extends to the scenario of translationally invariant systems in states far from equilibrium, which require less local control to prepare. Spin-wave evolution is completely determined by the system's dispersion relation, and the latter typically depends on a small number of external, physical parameters. Therefore, this new insight into correlation dynamics opens up the possibility not only of predicting but also of controlling the propagation velocity and dispersion rate, by manipulating these parameters. We demonstrate this analytically in a simple, example system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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