Exact quantum dynamics in structured environments
Exact quantum dynamics in structured environments
复制标题
DOI：
10.1103/physrevresearch.2.013265
复制
发表时间：
2019-07
影响因子：
4.2
通讯作者：
Dominic Gribben;A. Strathearn;Jake Iles-Smith;D. Kilda;A. Nazir;B. Lovett;P. Kirton
中科院分区：
文献类型：
--
作者：
Dominic Gribben;A. Strathearn;Jake Iles-Smith;D. Kilda;A. Nazir;B. Lovett;P. Kirton
许多具有重要技术意义的量子系统的动力学都是由它们与少数环境模式的相互作用所主导的。这种高度结构化的环境引起了长寿命的浴相关性，诱导复杂的动态，这是非常难以模拟。当系统不同部分之间的空间相关性很重要时，这些困难会进一步加剧。通过对一对两能级量子系统在一个共同的，结构化的，环境中的动力学建模，我们表明，最近开发的数值方法，时间演化矩阵乘积算子，能够准确地模拟在这些条件下。我们发现，调整分离，以匹配的主导环境模式的波长可以大大修改系统的动力学。为了进一步探索这种行为，我们表明，浴的完整动态可以直接从系统的动态计算，从而使我们能够发展观察到的复杂系统动态的直觉。
The dynamics of a wide range of technologically important quantum systems are dominated by their interaction with just a few environmental modes. Such highly structured environments give rise to long-lived bath correlations that induce complex dynamics which are very difficult to simulate. These difficulties are further aggravated when spatial correlations between different parts of the system are important. By modeling the dynamics of a pair of two-level quantum systems in a common, structured, environment we show that a recently developed numerical approach, the time-evolving matrix product operator, is capable of accurate simulation under exactly these conditions. We find that tuning the separation to match the wavelength of the dominant environmental modes can drastically modify the system dynamics. To further explore this behavior, we show that the full dynamics of the bath can be calculated directly from those of the system, thus allowing us to develop intuition for the complex system dynamics observed.