Dynamics of strongly coupled disordered dissipative spin-boson systems

Fiorelli, Eliana; Rotondo, Pietro; Carollo, Federico; Marcuzzi, Matteo; Lesanovsky, Igor

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 a 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 towards the possibility of using strongly coupled dissipative spin-boson systems for engineering complex energy landscapes together with an appropriate cooling dynamics.

Citation

Fiorelli, E., Rotondo, P., Carollo, F., Marcuzzi, M., & Lesanovsky, I. (2020). Dynamics of strongly coupled disordered dissipative spin-boson systems. Physical Review Research, 2(1), Article 013198. https://doi.org/10.1103/physrevresearch.2.013198

• Journal Article Type: Article
• Acceptance Date: Nov 20, 2019
• Online Publication Date: Feb 24, 2020
• Publication Date: Feb 24, 2020
• Deposit Date: Nov 25, 2019
• Publicly Available Date: Feb 25, 2021
• Journal: Physical Review Research
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 2
• Issue: 1
• Article Number: 013198
• DOI: https://doi.org/10.1103/physrevresearch.2.013198
• Public URL: https://nottingham-repository.worktribe.com/output/3404553
• Publisher URL: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.013198