Entangling Power of an Expanding Universe

Details Entangling Power of an Expanding Universe Entangling Power of an Expanding Universe

2007-11-20

arxiv.org/abs/0711.3066v5

Phys. Rev. D 79, 044027 (2009)

Physics

Quantum Physics

5 pages, 2 figures; v5: final published version

Scientific paper

10.1103/PhysRevD.79.044027

We show that entanglement can be used to detect spacetime curvature. Quantum fields in the Minkowski vacuum are entangled with respect to local field modes. This entanglement can be swapped to spatially separated quantum systems using standard local couplings. A single, inertial field detector in the exponentially expanding (de Sitter) vacuum responds as if it were bathed in thermal radiation in a Minkowski universe. We show that using two inertial detectors, interactions with the field in the thermal case will entangle certain detector pairs that would not become entangled in the corresponding de Sitter case. The two universes can thus be distinguished by their entangling power.

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