Exact Dynamics of Nonadditive Environments in Non-Markovian Open Quantum Systems
Exact Dynamics of Nonadditive Environments in Non-Markovian Open Quantum Systems
复制标题
DOI：
10.1103/prxquantum.3.010321
复制
发表时间：
2021-09
期刊：
影响因子：
9.7
通讯作者：
Dominic Gribben;D. Rouse;Jake Iles-Smith;A. Strathearn;Henry Maguire;P. Kirton;A. Nazir;E. Gauger;B. Lovett
中科院分区：
文献类型：
--
作者：
Dominic Gribben;D. Rouse;Jake Iles-Smith;A. Strathearn;Henry Maguire;P. Kirton;A. Nazir;E. Gauger;B. Lovett
当一个量子系统强烈耦合到多个浴时，通常不再可能通过简单地添加每个浴的单独效应来描述所产生的系统动力学。然而，捕捉这样的多浴系统动态到目前为止，需要近似，可以掩盖一些非加性效应。在这里，我们提出了一个数值上精确和有效的技术来解决这个问题，建立在时间演化矩阵乘积运算符（克里思）表示。我们测试的方法，将其应用到一个简单的模型系统，表现出非添加剂的行为：一个两级偶极耦合到振动和光学浴。尽管没有直接耦合，但系统介导的浴之间存在有效的相互作用，当振动耦合较强时，可以导致物质系统中的粒子数反转。我们基准和验证多浴克里思对两种近似方法-一个基于极化子变换，其他的反应坐标的识别-在探索的制度，同时强振动和光学耦合的近似技术打破。在这里，我们发现了一个新的制度，量子芝诺效应导致电子系统的完全混合状态。
When a quantum system couples strongly to multiple baths then it is generally no longer possible to describe the resulting system dynamics by simply adding the individual effects of each bath. However, capturing such multi-bath system dynamics has up to now required approximations that can obscure some of the non-additive effects. Here we present a numerically-exact and efficient technique for tackling this problem that builds on the time-evolving matrix product operator (TEMPO) representation. We test the method by applying it to a simple model system that exhibits non-additive behaviour: a two-level dipole coupled to both a vibrational and an optical bath. Although not directly coupled, there is an effective interaction between the baths mediated by the system that can lead to population inversion in the matter system when the vibrational coupling is strong. We benchmark and validate multi-bath TEMPO against two approximate methods - one based on a polaron transformation, the other on an identification of a reaction coordinate - before exploring the regime of simultaneously strong vibrational and optical coupling where the approximate techniques break down. Here we uncover a new regime where the quantum Zeno effect leads to a fully mixed state of the electronic system.