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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Integrable models are characterized by the existence of stable excitationsthat can propagate indefinitely without decaying. This includes multi-magnonbound states in the celebrated XXZ spin chain model and its integrable Floquetcounterpart. A recent Google Quantum AI experiment [A. Morvan et al., Nature612, 240 (2022)] realizing the Floquet model demonstrated the persistence ofsuch collective excitations even when the integrability is broken: thisobservation is at odds with the expectation of ergodic dynamics in genericnon-integrable systems. We here study the spectrum of the model realized in theexperiment using exact diagonalization and physical arguments. We find thatisolated bands corresponding to the descendants of the exact bound states ofthe integrable model are clearly observable in the spectrum for a large rangeof system sizes. However, our numerical analysis of the localization propertiesof the eigenstates suggests that the bound states become unstable in thethermodynamic limit. A perturbative estimate of the decay rate agrees with theprediction of an eventual instability for large system sizes.

Robustness and eventual slow decay of bound states of interacting microwave photons in the Google Quantum AI experiment