论文标题

短暂穿越碰撞模型的多部分开放量子动力学

A brief journey through collision models for multipartite open quantum dynamics

论文作者

Cattaneo, Marco, Giorgi, Gian Luca, Zambrini, Roberta, Maniscalco, Sabrina

论文摘要

量子碰撞模型是一种有用的方法,可以通过系统与某些环境的某些粒子之间的重复相互作用来描述开放量子系统的动力学,这些方法通常称为“ Ancillas”。在本文中,我们回顾了由多个子系统组成的多部分开放量子系统动力学的主要碰撞模型。特别是,我们对基于子系统和Ancillas之间基本碰撞的模型感兴趣,并以无穷小时的限制模拟全局和/或本地马尔可夫主方程。在讨论了基于通用碰撞的主方程的推导的数学细节之后,我们根据多部分系统的碰撞模型提供了一般思想,我们讨论了它们的优势和局限性,并展示了如何在量子计算机上模拟它们。此外,我们分析了基于纠缠的杂物的碰撞模型的某些属性,得出了它为小时间段生成的主方程,并证明该主方程的系数受到限制其常规性的约束。最后,我们提供了一个碰撞模型的示例,其中两个玻色词辅助物在两种模式挤压的热状态下纠缠在一起。

The quantum collision models are a useful method to describe the dynamics of an open quantum system by means of repeated interactions between the system and some particles of the environment, which are usually termed "ancillas". In this paper, we review the main collision models for the dynamics of multipartite open quantum systems, which are composed of several subsystems. In particular, we are interested in models that are based on elementary collisions between the subsystems and the ancillas, and that simulate global and/or local Markovian master equations in the limit of infinitesimal timestep. After discussing the mathematical details of the derivation of a generic collision-based master equation, we provide the general ideas at the basis of the collision models for multipartite systems, we discuss their strengths and limitations, and we show how they may be simulated on a quantum computer. Moreover, we analyze some properties of a collision model based on entangled ancillas, derive the master equation it generates for small timesteps, and prove that the coefficients of this master equation are subject to a constraint that limits their generality. Finally, we present an example of this collision model with two bosonic ancillas entangled in a two-mode squeezed thermal state.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源