Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement
Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement
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DOI：
10.1103/prxquantum.3.020348
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发表时间：
2021-12
期刊：
影响因子：
9.7
通讯作者：
Valentin Link;K. Müller;R. Lena;K. Luoma;F. Damanet;W. Strunz;A. Daley
中科院分区：
文献类型：
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作者：
Valentin Link;K. Müller;R. Lena;K. Luoma;F. Damanet;W. Strunz;A. Daley
非马尔可夫开放量子系统的一个重要挑战是理解我们从输出场的连续测量中获得了什么信息。例如，多模腔QED系统中的原子提供了一个令人兴奋的平台来研究多体现象，其中原子之间以及与腔的强耦合，但是强耦合使得从输出光推断原子的条件态变得复杂。在这项工作中，我们解决这个问题，通过一个条件层次的运动方程，它提供了一个精确的条件下减少描述的监测（和连续反馈）描述减少原子状态。我们利用这种形式主义，研究如何不同的监测模式的多模腔影响我们的信息增益的原子状态，并提高自旋压缩通过测量和反馈在强耦合制度。这项工作为理解非马尔可夫开放量子系统的连续监测提供了机会，无论是在实践层面还是在基础层面。
An important challenge in non-Markovian open quantum systems is to understand what information we gain from continuous measurement of an output field. For example, atoms in multimode cavity QED systems provide an exciting platform to study many-body phenomena in regimes where the atoms are strongly coupled amongst themselves and with the cavity, but the strong coupling makes it complicated to infer the conditioned state of the atoms from the output light. In this work we address this problem, describing the reduced atomic state via a conditioned hierarchy of equations of motion, which provides an exact conditioned reduced description under monitoring (and continuous feedback). We utilise this formalism to study how different monitoring for modes of a multimode cavity affects our information gain for an atomic state, and to improve spin squeezing via measurement and feedback in a strong coupling regime. This work opens opportunities to understand continuous monitoring of non-Markovian open quantum systems, both on a practical and fundamental level.