Bound states in ultrastrong waveguide QED

Juan Román-Roche, Eduardo Sánchez-Burillo, and David Zueco
Phys. Rev. A 102, 023702 – Published 3 August 2020

Abstract

We discuss the properties of bound states in finite-bandwidth waveguide QED beyond the rotating wave approximation or excitation-number-conserving light-matter coupling models. Therefore, we extend the standard calculations to a broader range of light-matter strengths, in particular, in the so-called ultrastrong coupling regime. We do this using the polaron technique. Our main results are as follows: We compute the spontaneous emission rate, which is renormalized as compared with the Fermi golden rule formula. We generalize the existence criteria for bound states, their properties, and their role in the qubit thermalization. We discuss effective spin-spin interactions through both vacuum fluctuations and bound states. Finally, we sketch a perfect state-transfer protocol among distant emitters mediated by bound states.

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  • Received 15 February 2020
  • Accepted 10 July 2020

DOI:https://doi.org/10.1103/PhysRevA.102.023702

©2020 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Juan Román-Roche1, Eduardo Sánchez-Burillo2, and David Zueco1,3

  • 1Instituto de Nanociencia y Materiales de Aragón (INMA) and Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
  • 2Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
  • 3Fundación ARAID, Campus Río Ebro, 50018 Zaragoza, Spain

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Issue

Vol. 102, Iss. 2 — August 2020

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