Vacuum entanglement probes for ultra-cold atom systems

Abstract:This study explores the transfer of nonclassical correlations from an ultra-cold atom system to a pair of pulsed laser beams. Through nondestructive local probe measurements, we introduce an alternative to destructive techniques for mapping BEC entanglement. Operating at ultralow temperatures, the setup emulates a relativistic vacuum field. We show that lasers can serve as Unruh-DeWitt detectors for BEC vacuum phonons. A quantum vacuum holds intrinsic entanglement, transferable to distant probes briefly interacting with it - a phenomenon termed `entanglement harvesting'. Our study accomplishes two primary objectives: first, establishing a mathematical equivalence between a pair of pulsed laser probes interacting with an effective relativistic field and the entanglement harvesting protocol; and second, to closely examine the potential and persisting obstacles for realising this protocol in an ultra-cold atom experiment.

arXiv:2308.07892 [quant-ph]

(or arXiv:2308.07892v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2308.07892 Focus to learn more arXiv-issued DOI via DataCite

New J. Phys. 26, 105001 (2024)

https://doi.org/10.1088/1367-2630/ad8675 Focus to learn more DOI(s) linking to related resources

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