A two-particle, four-mode interferometer for atoms
Pierre Dussarrat, Maxime Perrier, Almazbek Imanaliev (LNE - SYRTE),, Raphael Lopes, Alain Aspect, Marc Cheneau, Denis Boiron, Christoph Westbrook
TL;DR
This paper introduces a free-space atom interferometer utilizing entangled atom pairs from a Bose-Einstein condensate, demonstrating two-particle interference and paving the way for Bell inequality tests on atomic momentum.
Contribution
It presents a novel interferometer setup for atoms using Bragg diffraction, enabling entanglement observation and potential Bell inequality testing.
Findings
Observation consistent with entangled atom pairs
Successful demonstration of two-particle interference
Framework for future Bell inequality experiments
Abstract
We present a free-space interferometer to observe two-particle interference of a pair of atoms with entangled momenta. The source of atom pairs is a Bose--Einstein condensate subject to a dynamical instability, and the interferometer is realized using Bragg diffraction on optical lattices, in the spirit of our recent Hong--Ou--Mandel experiment. We report an observation consistent with an entangled state at the input of the interferometer. We explain how our current setup can be extended to enable a test of a Bell inequality on momentum observables.
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