Quantum Physics
[Submitted on 20 Nov 2007 (v1), last revised 24 Feb 2009 (this version, v5)]
Title:Entangling Power of an Expanding Universe
View PDFAbstract: 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.
Submission history
From: Nicolas Menicucci [view email][v1] Tue, 20 Nov 2007 05:58:52 UTC (220 KB)
[v2] Sun, 2 Dec 2007 21:44:01 UTC (220 KB)
[v3] Tue, 4 Dec 2007 10:15:36 UTC (220 KB)
[v4] Sat, 31 Jan 2009 21:35:03 UTC (313 KB)
[v5] Tue, 24 Feb 2009 06:07:09 UTC (313 KB)
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