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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Nonlocality is the defining feature of quantum entanglement. Entangled stateswith multiple particles are of crucial importance in fundamental tests ofquantum physics as well as in many quantum information tasks. One of thearchetypal multipartite quantum states, Greenberger-Horne-Zeilinger (GHZ)state, allows one to observe the striking conflict of quantum physics to localrealism in the so-called all-versus-nothing way. This is profoundly differentfrom Bell's theorem for two particles, which relies on statistical predictions.Here, we demonstrate an integrated photonic chip capable of generating andmanipulating the four-photon GHZ state. We perform a complete characterizationof the four-photon GHZ state using quantum state tomography and obtain a statefidelity of 0.729(6). We further use the all-versus-nothing test and the Mermininequalities to witness the quantum nonlocality of GHZ entanglement. Our workpaves the way to perform fundamental tests of quantum physics with complexintegrated quantum devices.

Observation of quantum nonlocality in Greenberger-Horne-Zeilinger entanglement on a silicon chip