RT Journal Article
T1 Connecting nth order generalised quantum Rabi models: Emergence of nonlinear spin-boson coupling via spin rotations
A1 Casanova, Jorge
A1 Puebla Antunes, Ricardo
A1 Moya Cessa, Hector
A1 Plenio, Martin B.
AB We establish an approximate equivalence between a generalised quantum Rabi model and its nth order counterparts, where spin-boson interactions are nonlinear as they comprise a simultaneous exchange of n bosonic excitations. Although there exists no unitary transformation between these models, we demonstrate their equivalence to a good approximation in a wide range of parameters. This shows that nonlinear spin-boson couplings, i.e., nth order quantum Rabi models, are accessible to quantum systems with only linear coupling between boson and spin modes by simply adding spin rotations and after an appropriate transformation. Furthermore, our result prompts novel approximate analytical solutions to the dynamics of the quantum Rabi model in the ultrastrong coupling regime improving previous approaches.
SN 2056-6387
YR 2018
FD 2018-09-28
LK https://hdl.handle.net/10016/38614
UL https://hdl.handle.net/10016/38614
LA eng
DS e-Archivo
RD 1 sept. 2024