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 study isolated finite interacting quantum systems after an instantaneousperturbation and show three scenarios in which the probability for finding theinitial state later in time (fidelity) decays nonexponentially, often all theway to saturation. The decays analyzed involve Gaussian, Bessel of the firstkind, and cosine squared functions. The Gaussian behavior emerges in systemswith two-body interactions in the limit of strong perturbation. The Besselfunction, associated with the evolution under full random matrices, is obtainedwith surprisingly sparse random matrices. The cosine squared behavior,established by the energy-time uncertainty relation, is approached after alocal perturbation in space.

Nonexponential fidelity decay in isolated interacting quantum systems