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  • Letter
  • Open Access

Resonant light enhances phase coherence in a cavity QED simulator of fermionic superfluidity

Shane P. Kelly1,2,*, James K. Thompson3, Ana Maria Rey2,3,4, and Jamir Marino1,2

  • 1Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany
  • 2Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030, USA
  • 3JILA, NIST, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
  • 4Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA

  • *shakelly@uni-mainz.de

Phys. Rev. Research 4, L042032 – Published 22 November, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L042032

Abstract

Cavity QED experiments are natural hosts for nonequilibrium phases of matter supported by photon-mediated interactions. In this work, we consider a cavity QED simulation of the BCS model of superfluidity, by studying regimes where the cavity photons act as dynamical degrees of freedom instead of mere mediators of the interaction via virtual processes. We find an enhancement of long time coherence following a quench whenever the cavity frequency is tuned into resonance with the atoms. We discuss how this is equivalent to enhancement of non-equilibrium superfluidity and highlight similarities to an analogous phenomena recently studied in solid state quantum optics. We also discuss the conditions for observing this enhanced resonant pairing in experiments by including the effect of photon losses and inhomogeneous coupling in our analysis.

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