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  • Letter
  • Open Access

Frustration-induced anomalous transport and strong photon decay in waveguide QED

Ron Belyansky1,2,*, Seth Whitsitt1,2, Rex Lundgren1,2, Yidan Wang2, Andrei Vrajitoarea3,†, Andrew A. Houck3, and Alexey V. Gorshkov1,2

  • 1Joint Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, Maryland 20742, USA
  • 2Joint Quantum Institute, NIST/University of Maryland, College Park, Maryland 20742, USA
  • 3Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08540, USA

  • *rbelyans@umd.edu
  • †Present address: James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
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Phys. Rev. Research 3, L032058 – Published 7 September, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032058

Abstract

We study the propagation of photons in a one-dimensional environment consisting of two noninteracting species of photons frustratingly coupled to a single spin 1/2. The ultrastrong frustrated coupling leads to an extreme mixing of the light and matter degrees of freedom, resulting in the disintegration of the spin and a breakdown of the “dressed-spin,” or polaron, description. Using a combination of numerical and analytical methods, we show that the elastic response becomes increasingly weak at the effective spin frequency, showing instead an increasingly strong and broadband response at higher energies. We also show that the photons can decay into multiple photons of smaller energies. The total probability of these inelastic processes can be as large as the total elastic scattering rate, or half of the total scattering rate, which is as large as it can be. The frustrated spin induces strong anisotropic photon-photon interactions that are dominated by interspecies interactions. Our results are relevant to state-of-the-art circuit and cavity quantum electrodynamics experiments.

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Phys. Rev. Research 3, L032058– Published 7 September, 2021
  • Received 24 July 2020
  • Accepted 16 August 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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