Strong coupling and active cooling in a finite temperature hybrid atom-cavity system

Keary, L. F. and Pritchard, J. D. (2022) Strong coupling and active cooling in a finite temperature hybrid atom-cavity system. Physical Review A, 105. 013707. ISSN 2469-9926

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    Abstract

    For a standard two-level atom coupled to the quantized field of a resonant cavity, finite temperature effects lead to thermal occupation of the cavity modes that obfuscates measurement of the quantum nature of the atom-light interaction. In this paper we demonstrate that using a hybrid system of a superconducting cavity coupled to a multi-level Rydberg atom it is possible to observe the quantum nature of strong coupling even at finite temperatures, and to exploit this coupling to permit cooling of the thermal microwave mode towards the ground-state, enabling observation of coherent vacuum Rabi oscillations even at 4~K. Cooling for multiple atoms is also explored, showing maximal cooling for small samples making this a viable approach to cavity cooling with potential applications in long-range coupling of superconducting circuits via thermal waveguides.

    ORCID iDs

    Keary, L. F. and Pritchard, J. D. ORCID logoORCID: https://orcid.org/0000-0003-2172-7340;