Abstract
We employ an approach wherein the ground state entanglement of a relativistic free scalar field is directly probed in a controlled manner. The approach consists of having a pair of initially nonentangled detectors locally interact with the vacuum for a finite duration , such that the two detectors remain causally disconnected, and then analyzing the resulting detector mixed state. We show that the correlations between arbitrarily far-apart regions of the vacuum cannot be reproduced by a local hidden-variable model, and that as a function of the distance between the regions, the entanglement decreases at a slower rate than .
- Received 23 November 2004
DOI:https://doi.org/10.1103/PhysRevA.71.042104
©2005 American Physical Society