How to Get Quantum Communication from Nothingness express
Two antennas in a soundproof room pick up only noise. But if you spin them, especially in opposite directions, a common signal emerges from the static. Quantum sensors in a vacuum work similarly: acceleration helps them pull quantum entanglement out of the void — an invisible link akin to what forms near the horizon of a black hole.
Physicists then made the geometry more complex: first they ‘curled’ the room into a ring, and the signal started arriving from both sides. Next, they superimposed two shapes of the room, like two versions of spacetime, and their interference, overlapping waves, dramatically boosted the entanglement. Surprisingly, sensors accelerated in opposite directions feel each other far more strongly than when moving in parallel.
All this shows that the vacuum isn't empty: it teems with short-lived ghost particles that carry entropy and can weave quantum networks. For now, it's just a theory, but in the future, secure communication channels may be built on such principles.
Original abstract
as written by the authors arXiv:2605.26490
We study entanglement harvested by Unruh DeWitt detectors following Rindler trajectories in compactified and superposed Minkowski spacetime. We consider different directions of acceleration (both parallel and antiparallel), separation between detectors and direction of spatial compactification mutually perpendicular to each other. Using the standard entanglement harvesting protocol, we analyze how these features influence the extracted correlations. When detector separation is perpendicular to the direction of acceleration, the harvested entanglement is uniformly suppressed due to increased spacelike separation. Compactification enhances field correlations leading to an increased concurrence and an extended harvesting range at higher accelerations. Additionally, we show that spacetime superposition introduces interference effects that further enlarge the entanglement harvesting region in parameter space, particularly in the high acceleration regime. We also find that the effect of antiparallel acceleration yielding significantly higher entanglement than parallel acceleration prevails in compactified and superposed spacetime.
The quantum vacuum isn't empty: it's populated by ghost particles that pop in and out of existence, building bridges for quantum entanglement.
The idea of extracting something from the vacuum inspires science fiction writers: for instance, the vacuum engines in the series ‘Stargate’ run on the energy of quantum fluctuations.