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

It is well known that jointly measurable observables cannot lead to aviolation of any Bell inequality - independent of the state and themeasurements chosen at the other site. In this letter we prove the converse:every pair of incompatible quantum observables enables the violation of a Bellinequality and therefore must remain incompatible within any other no-signalingtheory. While in the case of von Neumann measurements it is sufficient to usethe same pair of observables at both sites, general measurements can requiredifferent choices. The main result is obtained by showing that for arbitrarydimension the CHSH inequality provides the Lagrangian dual of thecharacterization of joint measurability. This leads to a simple criterion forjoint measurability beyond the known qubit case.

Measurements incompatible in Quantum Theory cannot be measured jointly in any other local theory