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Bell correlations between spatially separated pairs of atoms.

Abstract：

:Bell correlations are a foundational demonstration of how quantum entanglement contradicts the classical notion of local realism. Rigorous validation of quantum nonlocality have only been achieved between solid-state electron spins, internal states of trapped atoms, and photon polarisations, all weakly coupling to gravity. Bell tests with freely propagating massive particles, which could provide insights into the link between gravity and quantum mechanics, have proven to be much more challenging to realise. Here we use a collision between two Bose-Einstein condensates to generate spin entangled pairs of ultracold helium atoms, and measure their spin correlations along uniformly rotated bases. We show that correlations in the pairs agree with the theoretical prediction of a Bell triplet state, and observe a quantum mechanical witness of Bell correlations with [Formula: see text] significance. Extensions to this scheme could find promising applications in quantum metrology, as well as for investigating the interplay between quantum mechanics and gravity.

journal_name

Nat Commun

journal_title

Nature communications

authors

Shin DK,Henson BM,Hodgman SS,Wasak T,Chwedeńczuk J,Truscott AG

doi

10.1038/s41467-019-12192-8

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

4447

issue

1

issn

2041-1723

pii

10.1038/s41467-019-12192-8

journal_volume

10

pub_type

杂志文章

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