Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime

Jul 18, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session


The coupling of a two-level system with a field mode, whose fully quantized field version is known as the quantum Rabi model (QRM), is among the central topics of quantum physics and recent quantum information technologies. When the coupling strength reaches the field mode frequency, the full QRM Hamiltionian comes into play, where excitations can be created out of the vacuum.

We demonstrate a novel approach for the realization of a periodic variant of the quantum Rabi model using two coupled vibrational modes of cold atoms in optical potentials, which has allowed us to reach a Rabi coupling strength of 6.5 times the bosonic field mode frequency, i.e., far in the so called deep strong coupling regime. For the first time, the coupling term dominates over all other energy scales. Field mode creation and annihilation upon e.g., de-excitation of the two-level system here approach equal magnitudes, and we observe the atomic dynamics in this novel experimental regime, revealing a subcycle timescale raise in field mode excitations, in good agreement with theoretical predictions. We have also studied the collapse and revival of the initial state in the system. The current experimental status will be presented.

Presenter name Geram Hunanyan
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Primary authors

Mr Geram Hunanyan (University of Bonn) Mr Johannes Koch (University of Bonn) Ms Stefanie Moll (University of Bonn) Mr Enrique Rico (Department of Physical Chemistry, University of the Basque Country UPV/EHU, IKERBASQUE, Basque Foundation for Science) Mr Enrique Solano (Department of Physical Chemistry, University of the Basque Country, IKERBASQUE, Basque Foundation for Science) Mr Martin Weitz (University of Bonn)

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