Refereed journal article or data article (A1)

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement




List of Authors: Link Valentin, Müller Kai, Lena Rosaria G, Luoma Kimmo, Damanet François, Strunz Walter T, Daley Andrew J

Publisher: AMER PHYSICAL SOC

Publication year: 2022

Journal: PRX Quantum

Journal name in source: PRX QUANTUM

Journal acronym: PRX QUANTUM

Volume number: 3

Issue number: 2

Number of pages: 16

DOI: http://dx.doi.org/10.1103/PRXQuantum.3.020348

URL: https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.3.020348

Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/175912787


Abstract
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 utilize 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.

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Last updated on 2022-12-08 at 08:14