Gravity-mediated decoherence

• URL: http://arxiv.org/abs/2402.11663v2
• Date: Tue, 9 Jul 2024 16:40:21 GMT
• Title: Gravity-mediated decoherence
• Authors: Dimitris Moustos, Charis Anastopoulos,
• Abstract summary: Small quantum system within the gravitational field of a massive body will be entangled with the quantum degrees of freedom of the latter. Massive body acts as an environment, and it induces non-unitary dynamics, noise, and decoherence to the quantum system. It is impossible to shield systems on Earth from this gravity-mediated decoherence, which could severely affect all experiments with macroscopic quantum systems.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A small quantum system within the gravitational field of a massive body will be entangled with the quantum degrees of freedom of the latter. Hence, the massive body acts as an environment, and it induces non-unitary dynamics, noise, and decoherence to the quantum system. It is impossible to shield systems on Earth from this gravity-mediated decoherence, which could severely affect all experiments with macroscopic quantum systems. We undertake a first-principles analysis of this effect, by deriving the corresponding open system dynamics. We find that near-future quantum experiments are not affected, but there is a strong decoherence effect at the human scale. The decoherence time for a superposition of two localized states of a human with an one meter separation is of the order of one second.

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