Cosmological quantum entanglement

Understand

We review recent literature on the connection between quantum entanglement and cosmology, with an emphasis on the context of expanding universes.

• We discuss recent theoretical results reporting on the production of entanglement in quantum fields due to the expansion of the underlying spacetime.
• We explore how these results are affected by the statistics of the field (bosonic or fermionic), the type of expansion (de Sitter or asymptotically stationary), and the coupling to spacetime curvature (conformal or minimal).
• We then consider the extraction of entanglement from a quantum field by coupling to local detectors and how this procedure can be used to distinguish curvature from heating by their entanglement signature.