Center for Theoretical Physics of the Universe (CTPU)

Entanglement harvesting with three Unruh-DeWitt detectors

by Laura Henderson (University of Waterloo)

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The quantum vacuum can be characterised by field correlations between spacetime points. Much work has been done on operationally probing bipartite entanglement from quantum fields on various spacetime backgrounds. We extend this work to probing the tripartite vacuum entanglement. We modify the entanglement harvesting protocol to couple three two-level quantum systems to a massless scalar field in Minkowski space and use the pi-tangle as a measure of the resulting tripartite entanglement. We find that it is possible to extract tripartite entanglement from the vacuum and that it is possible to do so over separation distances greater than allowed for bipartite extraction. We also find that for small separations between the detectors the CKW condition is violated indicating that for this region of the parameter space, higher order terms in the perturbative expansion should be included.