• Open Access

Dynamics of strongly coupled disordered dissipative spin-boson systems

Eliana Fiorelli, Pietro Rotondo, Federico Carollo, Matteo Marcuzzi, and Igor Lesanovsky
Phys. Rev. Research 2, 013198 – Published 24 February 2020

Abstract

Spin-boson Hamiltonians are an effective description for numerous quantum few- and many-body systems, such as atoms coupled to cavity modes, quantum electrodynamics in circuits, and trapped ion systems. While reaching the limit of strong coupling is possible in current experiments, the understanding of the physics in this parameter regime remains a challenge, especially when disorder and dissipation are taken into account. Here we investigate a regime where the spin dynamics can be related to an Ising energy function defined in terms of the spin-boson couplings. While in the coherent weak coupling regime it is known that an effective description in terms of spin Hamiltonian is possible, we show that a similar viewpoint can be adopted in the presence of dissipation and strong couplings. The resulting dynamics features approximately thermal regimes, separated by out-of-equilibrium ones in which detailed balance is broken. Moreover, we show that under appropriately chosen conditions one can even achieve cooling of the spin degrees of freedom. This points toward the possibility of using strongly coupled dissipative spin-boson systems for engineering complex energy landscapes together with an appropriate cooling dynamics.

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  • Received 13 May 2019
  • Accepted 20 November 2019

DOI:https://doi.org/10.1103/PhysRevResearch.2.013198

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.

Published by the American Physical Society

Physics Subject Headings (PhySH)

General PhysicsStatistical Physics & ThermodynamicsAtomic, Molecular & Optical

Authors & Affiliations

Eliana Fiorelli1,2, Pietro Rotondo1,2, Federico Carollo1,2,3, Matteo Marcuzzi1,2, and Igor Lesanovsky1,2,3

  • 1School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
  • 2Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham NG7 2RD, United Kingdom
  • 3Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany

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Vol. 2, Iss. 1 — February - April 2020

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