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arXiv · 2506.07172

Quenched entanglement harvesting

Adrian Lopez-Raven·Robert B. Mann·Jorma Louko
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Abstract

Ultracold fermionic atoms in an optical lattice, with a sudden position-dependent change (a quench) in the effective dispersion relation, have been proposed by Rodr\'iguez-Laguna et al as an analogue spacetime test of the Unruh effect. We provide new support for this analogue by analysing the entanglement of a scalar field in a (1 + 1)-dimensional continuum spacetime with a similar quench, and the harvesting of this entanglement by a pair of Unruh-DeWitt detectors. We present numerical evidence that the concurrence and mutual information harvested by the detectors are qualitatively similar to those in Rindler spacetime, but they exhibit a small yet noticeable variation when the energy pulse created by the quench crosses the detectors. These findings provide further motivation to implement the experimental proposal of Rodr\'iguez-Laguna et al.

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Adrian Lopez-Raven, Robert B. Mann, Jorma Louko. 2025-06-08. Quenched entanglement harvesting. https://doi.org/10.1103/lyhy-ftxz

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