Harnessing entanglement and decoherence in driven-dissipative quantum impurities

“HADE-QUAM”项目探索了与费米子多体环境耦合的量子杂质的噪声驱动动力学中的纠缠跃迁和退相干控制。该项目分为两个阶段：首先，我们将首先研究由局部加热驱动的相互作用费米子线中量子纠缠监测的动态相变的开始。研究愿景是促进耗散杂质在冷原子实验中作为新形式的非平衡相变的代理。在项目的第二阶段，我们研究了当噪声与无间隙模式交织时退相干的临界减速。该装置的灵感来自于典型的近藤模型，它将用于测试用玻色散化变量描述多体驱动耗散动力学的猜想。“HADE-QUAM”是一个跨学科的项目，其方法（变分计算，累积展开，矩阵乘积状态，非平衡场论和重整化群），它旨在连接物理中不同研究领域的界面主题，从凝聚态和开放量子系统中的许多粒子问题，包括与非平衡统计力学和量子纠缠相关的问题。“HADE-QUAM”研究的两个方面是相互关联的，该项目的长期目标之一是提出基于量子磁性杂质器件的实验，能够在强耗散状态下见证纠缠和退相干的普遍相变。

The project ‘HADE-QUAM’ explores entanglement transitions and decoherence control in the noise driven dynamics of quantum impurities coupled to a fermionic many-body environment. The project is articulated in two phases: first, we will first study the onset of dynamical phase transitions monitored by quantum entanglement in interacting fermionic wires driven by local heating. The research vision is to promote dissipative impurities as a proxy for novel forms of non-equilibrium phase transition in cold atoms experiments. In the second stage of the project, we study the critical slowdown of decoherence when noise intertwines with gapless modes. The setup is inspired by the prototypical Kondo model, and it will serve to test a conjecture on the description of many-body driven-dissipative dynamics in terms of bosonised variables. ‘HADE-QUAM’ is an interdisciplinary project in its methods (variational calculations, cumulant expansions, matrix-product states, non-equilibrium field theory and renormalisation group), and it aims at connecting topics at the interface of diverse research areas in physics, ranging from many particle problems in condensed matter and in open quantum systems, including questions relevant for non-equilibrium statistical mechanics and quantum entanglement. The two aspects studied in ‘HADE-QUAM’ are interconnected, and one of the long-term goals of the project is to propose experiments based on quantum magnetic impurity devices capable to witness universal phase transitions for entanglement and decoherence, in the strongly dissipative regime.