论文标题
使用链转换对巨大原子的非扰动处理
Non-perturbative treatment of giant atoms using chain transformations
论文作者
论文摘要
与声学波导相连的超导电路已经扩展了可以使用量子光学工具实验研究的现象范围。特别是巨型人造原子允许对电偶极近似分解的系统进行研究，并且明显的非马克维亚效应变得很重要。尽管以前对巨型原子的研究集中在旋转波近似的领域，但我们超越了这一点，并对在不忽略反射术语的制度中，对与环境的巨大原子进行了数值精确的分析。为了实现这一目标，我们使用兰开斯的变换将哈密顿田田施加到一维链的形式中，并采用矩阵 - 产品态模拟。这种方法可访问广泛的系统浴有观测值以及以前未开发的参数制度。
Superconducting circuits coupled to acoustic waveguides have extended the range of phenomena that can be experimentally studied using tools from quantum optics. In particular giant artificial atoms permit the investigation of systems in which the electric dipole approximation breaks down and pronounced non-Markovian effects become important. While previous studies of giant atoms focused on the realm of the rotating-wave approximation, we go beyond this and perform a numerically exact analysis of giant atoms strongly coupled to their environment, in regimes where counterrotating terms cannot be neglected. To achieve this, we use a Lanczos transformation to cast the field Hamiltonian into the form of a one-dimensional chain and employ matrix-product state simulations. This approach yields access to a wide range of system-bath observables and to previously unexplored parameter regimes.
