Original title: Gravitationally Induced Entanglement Across an Event Horizon
Hatim Salih · September 2026
Physicists long thought that once a particle drops past a black hole's event horizon without being linked to an outside particle, the two can never dynamically link up. In quantum physics, this link is called entanglement, where two particles become connected so that one instantly reflects the other. Using a gravitational retarded-potential model, researchers found that gravity can actually build entanglement from scratch between freely falling particles separated by an event horizon. But getting that entangled state out radially requires slowing down. That deceleration releases low-energy gravitational radiation, triggering dephasing that destroys the entanglement. However, using optical masses lets researchers harvest entanglement sideways through quantum erasure, teleporting the state across space while showing how motion near horizons shapes quantum connections.
Two dancers begin in perfect rhythm in the same room. A soundproof wall is erected, and they move to separate rooms. Normally, once apart, they can't create new coordination without seeing or hearing each other. Here, the dancers manage to establish a new rhythm across the wall, but if one tries to leave the room by forcing the door, the movement causes noise that disrupts the rhythm.
This finding challenges a long-held belief in physics, suggesting that quantum connections can form even across black hole horizons. It could reshape how we understand information and entanglement in extreme gravitational environments, affecting fields like quantum gravity and astrophysics.
The abstract does not specify whether these results are experimentally verified or only theoretical predictions. It focuses on a specific gravitational retarded-potential model and may not generalize to all types of black holes or quantum gravity theories. Additionally, the practical implications for real-world observations are not addressed.
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Gravitationally Induced Entanglement Across an Event Horizon — Hatim Salih
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.