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

States of open quantum systems usually decay continuously under environmentalinteractions. Quantum Markov semigroups model such processes in dissipativeenvironments. It is known that a finite-dimensional quantum Markov semigroupwith detailed balance induces exponential decay toward a subspace of invariantor fully decayed states. In contrast, we analyze continuous processes thatcombine coherent and stochastic processes, precluding detailed balance. First,we find counterexamples to analogous decay bounds for these processes and proveconditions under which they fail. Second, we prove that the relationshipbetween the strength of local noise applied to part of a larger system andoverall decay of the whole is non-monotonic. Noise can suppress interactionsthat would spread it. Faster decay of a subsystem may thereby slow overalldecay. We observe this interplay numerically and its discrete analogexperimentally on IBM Q systems. Our main results explain and generalize thephenomenon theoretically. Finally, we observe that in spite of its absence atearly times, exponential decay re-appears for unital, finite-dimensionalsemigroups at finite time.

Self-restricting Noise and Exponential Decay in Quantum Dynamics