Entanglement in an expanding spacetime

By J. Ball, Ivette Fuentes-Schuller, I. Fuentes-Schuller, Frederic P. Schuller. 2005

146 citations recorded by the source corpus.

Abstract We show that a dynamical spacetime generates entanglement between modes of a quantum field. Conversely, the entanglement encodes information concerning the underlying spacetime structure, which hints at the prospect of applications of this observation to cosmology. Here we illustrate this point by way of an analytically exactly soluble example, that of a scalar quantum field on a two-dimensional asymptotically flat Robertson–Walker expanding spacetime. We explicitly calculate the entanglement in the far future, for a quantum field residing in the vacuum state in the distant past. In this toy universe, it is possible to fully reconstruct the parameters of the cosmic history from the entanglement entropy.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/6916c378cbf94c7e0f9a376174e0ebbf82dc8e7b

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In Astronomy and Astrophysics

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Fundamental quantum optics experiments conceivable with satellites—reaching relativistic distances and velocities (2012, background): “…with metric tensor of the form ds 2 = dt 2 − a ( t ) 2 dE 2 ( dE 2 being the line element of ﬂat 3-space) for massive ﬁelds or for massless ﬁelds not conformally coupled to the curvature, entanglement is generated in quantum ﬁelds during periods of fast expansion such as inﬂation [117, 118].”
Quantum coherence and geometric quantum discord (2017, background): “(541) 70 Ball et al. (2006) studied entanglement for scalar field modes in the two-dimensional asymptotically flat RobertsonWalker expanding spacetime.”