English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We establish an approximate equivalence between a generalised quantum Rabimodel and its nth order counterparts where spin-boson interactions arenonlinear as they comprise a simultaneous exchange of $n$ bosonic excitations.Although there exists no unitary transformation between these models, wedemonstrate their equivalence to a good approximation in a wide range ofparameters. This shows that nonlinear spin-boson couplings, i.e. nth orderquantum Rabi models, are accessible to quantum systems with only linearcoupling between boson and spin modes by simply adding spin rotations and afteran appropriate transformation. Furthermore, our result prompts novelapproximate analytical solutions to the dynamics of the quantum Rabi model inthe ultrastrong coupling regime improving previous approaches.

Connecting nth order generalised quantum Rabi models: Emergence of nonlinear spin-boson coupling via spin rotations