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

In the long quest to identify and compensate the sources of decoherence inmany-body systems far from the ground state, the varied family of Loschmidtechoes (LEs) became an invaluable tool in several experimental techniques. A LEinvolves a time-reversal procedure to assess the effect of perturbations in aquantum excitation dynamics. However, when addressing macroscopic systems oneis repeatedly confronted with limitations that seem insurmountable. This led toformulate the \textit{central hypothesis of irreversibility} stating that thetime-scale of decoherence, $T_3$, is proportional to the time-scale of themany-body interactions we reversed, $T_2$. We test this by implementing twoexperimental schemes based on Floquet Hamiltonians where the effective strengthof the dipolar spin-spin coupling, i.e. $1/T_2$, is reduced by a variable scalefactor $k$. This extends the perturbations time scale, $T_\Sigma$, in relationto $T_2$. Strikingly, we observe the superposition of the normalized Loschmidtechoes for the bigger values of $k$. This manifests the dominance of theintrinsic dynamics over the perturbation factors, even when the Loschmidt echois devised to reverse that intrinsic dynamics. Thus, in the limit where thereversible interactions dominate over perturbations, the LE decays within atime-scale, $T_3\approx T_2/R$ with $R=(0.15 \pm 0.01)$, confirming theemergence of a perturbation independent regime. These results support thecentral hypothesis of irreversibility.

Emergent decoherence induced by quantum chaos in a many-body system: A Loschmidt echo observation through NMR