Observation of entanglement in a cold atom analog of cosmological preheating
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912763315486720 |
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| author | Gondret, Victor Lamirault, Clothilde Dias, Rui Camier, Léa Micheli, Amaury Leprince, Charlie Marolleau, Quentin Rullier, Jean-René Robertson, Scott Boiron, Denis Westbrook, Christoph I. |
| author_facet | Gondret, Victor Lamirault, Clothilde Dias, Rui Camier, Léa Micheli, Amaury Leprince, Charlie Marolleau, Quentin Rullier, Jean-René Robertson, Scott Boiron, Denis Westbrook, Christoph I. |
| contents | 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 reveals the role played by vacuum fluctuations in seeding 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. These point towards future experimental probes of the late-time nonlinear regime where further analogies can be drawn with reheating, i.e. the thermalization of the post-inflationary Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_22024 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of entanglement in a cold atom analog of cosmological preheating Gondret, Victor Lamirault, Clothilde Dias, Rui Camier, Léa Micheli, Amaury Leprince, Charlie Marolleau, Quentin Rullier, Jean-René Robertson, Scott Boiron, Denis Westbrook, Christoph I. Quantum Gases General Relativity and Quantum Cosmology Pattern Formation and Solitons Quantum Physics 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 reveals the role played by vacuum fluctuations in seeding 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. These point towards future experimental probes of the late-time nonlinear regime where further analogies can be drawn with reheating, i.e. the thermalization of the post-inflationary Universe. |
| title | Observation of entanglement in a cold atom analog of cosmological preheating |
| topic | Quantum Gases General Relativity and Quantum Cosmology Pattern Formation and Solitons Quantum Physics |
| url | https://arxiv.org/abs/2506.22024 |