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

We demonstrate here that for a given mixed multi-qubit state if there are atleast two observers for whom mutual Einstein-Podolsky-Rosen steering ispossible, i.e. each observer is able to steer the other qubits into twodifferent pure states by spontaneous collapses due to von Neumann typemeasurements on his/her qubit, then nonexistence of local realistic models isfully equivalent to quantum entanglement (this is not so without thiscondition). This result leads to an enhanced version of Gisin's theorem(originally: all pure entangled states violate local realism). Local realism isviolated by all mixed states with the above steering property. The new class ofstates allows one e.g. to perform three party secret sharing with just pairs ofentangled qubits, instead of three qubit entanglements (which are currentlyavailable with low fidelity). This significantly increases the feasibility ofhaving high performance versions of such protocols. Finally, we discuss somepossible applications.

Beyond Gisin's Theorem and its Applications: Violation of Local Realism by Two-Party Einstein-Podolsky-Rosen Steering