Coherent many-body dynamics between a quantum system and its environment

量子物理目前正在从对物质的基本认识的传统角色转变为技术应用的主动控制工具。这需要在基础科学层面上开发新的工具，并对以前的边缘现象有新的理解。一个主要的组成部分是，量子应用需要通过依赖于时间的场来驱动控制和测量。嵌入量子系统的环境在这里扮演着重要的角色，通常被认为是通过退相干来抑制量子信息处理的。在这个项目中，我们探索了将环境作为积极的有利参与者包括在量子态操纵中的可能性。我们建立在以前获得的系统方法的基础上，包括系统和环境之间的相干波动，超越了通常的马尔可夫近似。将特别强调强关联物理在耦合系统的动力学中的作用，以及在相同的基础上处理空间和时间一致性。这将使我们了解如何利用环境本身的量子本质，并有针对性地将其用作实现对适当量子系统的量子操纵的工具。作为一种特殊应用，可以重新审查磁共振技术的基本基础，使这些重要应用的理论基础与低温物理和强关联物理的巨大实验进展保持同步，这正在使目前的理论框架达到极限。

Quantum physics is currently under transformation from its traditional role of fundamental understanding of matter to an active control tool for technological application. This requires on the basic science level the development of new tools and new understanding of previously marginal phenomena. A major component is that a quantum application requires driving by time dependent fields for both control and measurement. The environment in which a quantum system is embedded takes here an important role, often considered as an inhibitor of quantum information processing through decoherence. In this project we explore the possibility to include the environment as an active favourable player in quantum state manipulation. We build on previously acquired systematic method to include coherent fluctuations between the system and the environment, going past the usual Markov approximation. A special emphasis will be on the role of strong correlation physics in the coupled system's dynamics and the treatment of spatial and temporal coherence on the same footing. This will provide us with an understanding how to exploit the quantum nature of the environment itself and use it in a targeted way as a tool to achieve a quantum manipulation of the proper quantum system. As a special application the basic underpinning of magnetic resonance techniques could be re-examined, bringing the theoretical foundations of these important applications up to date with the tremendous experimental progress in low temperature physics and strong correlation physics that is bringing the current theoretical framework to its limits.