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

When Alice measures all her spin-$\half$ of a large ensemble of $N$ singlets,all along the same direction $\vec a$, she prepares at a distance an ensembleof spins for Bob which, because of statistical fluctuations, have a magneticmoment of the order $\sqrt{N}$. By making $N$ large enough, this magneticmoment can be made arbitrarily large. We show that, nevertheless, Bob can'tread out of this large magnetic moment Alice's choice of measurement direction$\vec a$. We also consider stronger than quantum correlations and show thatTsirelson's bound follows from the physical assumption that in the macroscopiclimit all measurements are compatible and that this should not lead tosignaling.

Quantum measurement of spins and magnets, and the classical limit of PR-boxes