2025/06/08 by Lopez-Raven, Adrian, Mann, Robert B., Louko, Jorma · 2 citations
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Quantum Physics (quant-ph)
paper · doi:10.48550/arxiv.2506.07172
Ultracold fermionic atoms in an optical lattice, with a sudden position-dependent change (a quench) in the effective dispersion relation, have been proposed by Rodríguez-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 Rodríguez-Laguna et al.