https://doi.org/10.1140/epjd/s10053-022-00551-y
Regular Article – Cold Matter and Quantum Gases
A matter-wave Rarity–Tapster interferometer to demonstrate non-locality
1
Department of Quantum Science and Technology, Research School of Physics, The Australian National University, 2601, Canberra, ACT, Australia
2
Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, 73019, Norman, OK, USA
3
Center for Quantum Research and Technology, The University of Oklahoma, 73019, Norman, OK, USA
4
School of Mathematics and Physics, The University of Queensland, 4072, QL, Brisbane, Australia
Received:
17
June
2022
Accepted:
28
October
2022
Published online:
16
December
2022
We present an experimentally viable approach to demonstrate quantum non-locality in a matter-wave system via a Rarity–Tapster interferometer using two 
-wave scattering halos generated by colliding helium Bose–Einstein condensates. The theoretical basis for this method is discussed, and its suitability is experimentally quantified. As a proof of concept, we demonstrate an interferometric visibility of 
, corresponding to a maximum CSHS-Bell parameter of 
, for the Clauser–Horne–Shimony–Holt (CHSH) version of the Bell inequality, between atoms separated by 
correlation lengths. This constitutes a significant step toward a demonstration of a Bell inequality violation for motional degrees of freedom of massive particles and possible measurements of quantum effects in a gravitationally sensitive system.
© The Author(s) 2022
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