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Quantum Physics
Title: The Fate of Entanglement
(Submitted on 7 Feb 2024 (v1), last revised 3 Apr 2024 (this version, v2))
Abstract: Quantum entanglement is a fundamentally non-local correlation between particles. In its simplest realisation, a measurement on one particle is affected by a prior measurement on its partner, irrespective of their separation. For multiple particles, purely collective types of entanglement exist but their detection, even theoretically, remains an outstanding open question. Here, we show that all forms of multi-party entanglement entirely disappear during the typical evolution of a system as it heats up, evolves in time, or as its parts become separated. These results follow from the nature of the entanglement-free continent in the space of physical states, and hold in great generality. We illustrate these phenomena with a frustrated molecular quantum magnet in and out of equilibrium. In contrast, if the particles are fermions, such as electrons, another notion of entanglement exists that precludes entanglement-free regions, and thus protects quantum correlations. These findings provide fundamental knowledge about the structure of entanglement in quantum matter and architectures, paving the way for its manipulation.
Submission history
From: Gilles Parez [view email][v1] Wed, 7 Feb 2024 19:00:06 GMT (278kb,D)
[v2] Wed, 3 Apr 2024 16:51:24 GMT (418kb,D)
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