Observation of entanglement in a cold atom analog of cosmological preheating

• URL: http://arxiv.org/abs/2506.22024v1
• Date: Fri, 27 Jun 2025 08:46:06 GMT
• Title: Observation of entanglement in a cold atom analog of cosmological preheating
• Authors: Victor Gondret, Clothilde Lamirault, Rui Dias, Léa Camier, Amaury Micheli, Charlie Leprince, Quentin Marolleau, Jean-René Rullier, Scott Robertson, Denis Boiron, Christoph I. Westbrook,
• Abstract summary: We observe entanglement between collective excitations of a Bose-Einstein condensate in a configuration analogous to particle production.<n>In our setup, the oscillation of the inflaton field is mimicked by the transverse breathing mode of a cigar-shaped condensate.<n>We observe entanglement of these pairs which demonstrates that vacuum fluctuations seeded the parametric growth, confirming the quantum origin of the excitations.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We observe entanglement between collective excitations of a Bose-Einstein condensate in a configuration analogous to particle production during the preheating phase of the early universe. In our setup, the oscillation of the inflaton field is mimicked by the transverse breathing mode of a cigar-shaped condensate, which parametrically excites longitudinal quasiparticles with opposite momenta. After a short modulation period, we observe entanglement of these pairs which demonstrates that vacuum fluctuations seeded the parametric growth, confirming the quantum origin of the excitations. As the system continues to evolve, we observe a decrease in correlations and a disappearance of non-classical features, pointing towards future experimental probes of the less understood interaction-dominated regime.

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