论文标题
非马克维亚量子过程中多个时间相关性的离散存储内核
A discrete memory-kernel for multi-time correlations in non-Markovian quantum processes
论文作者
论文摘要
对开放系统动态的有效模拟对于量子科学和技术科学至关重要。在这里，我们介绍了传输调整器或离散时间内存内核的概括，形式主义是多次测量场景。鉴于只有短时系统轨迹可用，转移调整方法长时间列出了长时间计算开放式几体量子系统状态的状态。在这里，我们可以将转移量的方法扩展到包括开放系统动力学的多个询问（例如测量）随着其发展而发展的过程，从而使我们能够将高阶短时相关函数传播到以后的时间，而无需进一步求助于基础的系统 - 环境发展。我们的方法利用了开放量子过程的过程调整描述，以代表和传播动力学，以从中提取任何多时间相关性的对象。为了说明该方法的实用性，我们研究了范式旋转玻色子模型中系统环境相关性的建立，并计算稳态发射光谱，并完全考虑到稳定状态下存在的系统 - 环境相关性。
Efficient simulations of the dynamics of open systems is of wide importance for quantum science and tech-nology. Here, we introduce a generalization of the transfer-tensor, or discrete-time memory kernel, formalism to multi-time measurement scenarios. The transfer-tensor method sets out to compute the state of an open few-body quantum system at long times, given that only short-time system trajectories are available. Here, we showthat the transfer-tensor method can be extended to processes which include multiple interrogations (e.g. measurements) of the open system dynamics as it evolves, allowing us to propagate high order short-time correlation functions to later times, without further recourse to the underlying system-environment evolution. Our approach exploits the process-tensor description of open quantum processes to represent and propagate the dynamics in terms of an object from which any multi-time correlation can be extracted. As an illustration of the utility of the method, we study the build-up of system-environment correlations in the paradigmatic spin-boson model, and compute steady-state emission spectra, taking fully into account system-environment correlations present in the steady state.
