Foundations of Physics 33 (1):167-176 (2003)

We explore the entanglement of the vacuum of a relativistic field by letting a pair of causally disconnected probes interact with the field. We find that, even when the probes are initially non-entangled, they can wind up to a final entangled state. This shows that entanglement persists between disconnected regions in the vacuum. However the probe entanglement, unlike correlations, vanishes once the regions become sufficiently separated. The relation between entropy, correlations and entanglement is discussed
Keywords entanglement  entropy  vacuum state  entanglement probes
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DOI 10.1023/A:1022875910744
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