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

The no-signaling constraint on bi-partite correlations is reviewed. It isshown that in order to obtain non-trivial Bell-type inequalities that discernno-signaling correlations from more general ones, one must go beyondconsidering expectation values of products of observables only. A new set ofnontrivial no-signaling inequalities is derived which have a remarkably closeresemblance to the CHSH inequality, yet are fundamentally different. A set ofinequalities by Roy and Singh and Avis et al., which is claimed to be usefulfor discerning no-signaling correlations, is shown to be trivially satisfied byany correlation whatsoever. Finally, using the set of newly derivedno-signaling inequalities a result with potential cryptographic consequences isproven: if different parties use identical devices, then, once they haveperfect correlations at spacelike separation between dichotomic observables,they know that because of no-signaling the local marginals cannot but becompletely random.

No-signaling, perfect bipartite dichotomic correlations and local randomness