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arXiv · 2605.19588

On the nature of entangling photons in horizon-induced decoherence

Max Joseph Fahn·Alessandro Pesci
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Abstract

Recently, it was discussed how the presence of a Killing horizon induces decoherence on a quantum system in a superposition of states. Focusing on the case of an electrically-charged system with superposed positions, this would happen due to ``entangling'' photons crossing the horizon while carrying information on the superposition. Purpose of this essay is to investigate this process in connection with black hole thermodynamics and the ensuing entropy bounds. We show that an apparent tension arising with the latter is resolved provided the entangling photons, expressing a modification of the field at, as well as inside the horizon, do not give rise to a flux across it. The storage of information in this field, not retrievable from an outside observer, causes the superposition to decohere.

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Max Joseph Fahn, Alessandro Pesci. 2026-05-19. On the nature of entangling photons in horizon-induced decoherence. https://arxiv.org/abs/2605.19588

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