Event horizons are tunable factories of quantum entanglement

TL;DR

This paper demonstrates that entanglement generated by event horizons can be actively controlled and enhanced using quantum information techniques, with implications for detecting Hawking radiation signatures in laboratory analogs.

Contribution

It introduces methods to modulate and boost entanglement at event horizons using squeezed inputs, advancing the understanding of quantum correlations in black hole physics.

Findings

Squeezed inputs increase entanglement across horizons.

Thermal noise degrades but does not eliminate tunable entanglement.

Tuning entanglement could aid in laboratory detection of Hawking radiation.

Abstract

That event horizons generate quantum correlations via the Hawking effect is well known. We argue, however, that the creation of entanglement can be modulated as desired, by appropriately illuminating the horizon. We adapt techniques from quantum information theory to quantify the entanglement produced during the Hawking process and show that, while ambient thermal noise (e.g., CMB radiation) degrades it, the use of squeezed inputs can boost the non-separability between the interior and exterior regions in a controlled manner. We further apply our ideas to analog event horizons concocted in the laboratory and insist that the ability to tune the generation of entanglement offers a promising route towards detecting quantum signatures of the elusive Hawking effect.