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

A measure of quantum non-Markovianity for an open system dynamics, based onrevivals of the distinguishability between system states, has been introducedin the literature using the trace distance as quantifier fordistinguishability. Recently it has been suggested to use as measure for thedistinguishability of quantum states the trace norm of Helstrom matrices, givenby weighted differences of statistical operators. Here we show that this newapproach, which generalizes the original one, is consistent with theinterpretation of information flow between the system and its environmentassociated to the original definition. To this aim we prove a bound on thegrowth of the external information, that is information which cannot beaccessed by performing measurements on the system only, as quantified by meansof the Helstrom matrix. We further demonstrate by means of example that it isof relevance in generalizing schemes for the local detection of initialcorrelations based on the increase of internal information. Finally we exploitthis viewpoint to show the optimality of a previously introduced strategy forthe local detection of quantum correlations.

Generalized trace distance approach to quantum non-Markovianity and detection of initial correlations