A1 Refereed original research article in a scientific journal
Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement
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
Article number: 020348
Volume: 3
Issue: 2
Number of pages: 16
DOI: https://doi.org/10.1103/PRXQuantum.3.020348
Web address : 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
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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