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Q: Fachverband Quantenoptik und Photonik
Q 48: Quantum Effects II
Q 48.1: Talk
Thursday, March 17, 2022, 10:30–10:45, Q-H13
Atomic Dynamics in Strongly Coupled Multimode Cavities under Continuous Measurement — Valentin Link1, •Kai Müller1, Rosaria G. Lena2, Kimmo Luoma3, François Damanet4, Walter T. Strunz1, and Andrew J. Daley2 — 1Institut für Theoretische Physik, TU Dresden, Dresden, Germany — 2Department of Physics and SUPA, University of Strathclyde, Glasgow, United Kingdom — 3Department of Physics and Astronomy, University of Turku, Turun Yliopisto, Finland — 4Department of Physics and CESAM, University of Liège, Liège, Belgium
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. An important challenge in this, and other related non-Markovian open quantum systems is to understand what information we gain about the atoms from continuous measurement of the output light, as most of the existing theoretical frameworks are restricted to either few cavity modes or weak atom-cavity coupling. In this work, we address this problem, describing the reduced atomic state via a hierarchy of equations of motion, which provide an exact conditioned reduced description under monitoring. We utilise this formalism to study how different monitoring for modes of a multimode cavity affects our knowledge about an atomic state, and to improve spin squeezing via measurement and feedback in a strong coupling regime. Our work opens opportunities to understand continuous monitoring of non-Markovian open quantum systems, both on a practical and fundamental level.