Vacuum entanglement enhancement by a weak gravitational field

TL;DR

This paper shows that a weak gravitational field can enhance the entanglement that vacuum fluctuations can generate between separated detectors, revealing a link between gravity and quantum entanglement.

Contribution

It demonstrates that curvature in spacetime can increase the amount of vacuum entanglement extractable by Unruh-DeWitt detectors, a novel insight into gravity's role in quantum correlations.

Findings

Entanglement extraction is enhanced by gravitational curvature.

Vacuum entanglement can be increased in curved spacetime.

Gravity influences quantum entanglement in the vacuum state.

Abstract

Separate regions in space are generally entangled, even in the vacuum state. It is known that this entanglement can be swapped to separated Unruh-DeWitt detectors, i.e., that the vacuum can serve as a source of entanglement. Here, we demonstrate that, in the presence of curvature, the amount of entanglement that Unruh-DeWitt detectors can extract from the vacuum can be increased.