# Spin-exchange collisions in hot vapors create and sustain bipartite entanglement

Source: [Spin-exchange collisions in hot vapors create and sustain bipartite entanglement](<https://www.sota2.com/research/paper/68fa3dd61e209131ce8e35c2>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:54:21.724Z

Authors: K. Mouloudakis, I. K. Kominis

Published: 2020-04-24T15:15:32.000Z

## Abstract

Spin-exchange collisions in alkali or alkali/noble gas vapors are at the basis of quantum sensing, nucleon structure studies, tests of fundamental symmetries, and medical imaging. We here show that spin-exchange collisions in hot alkali vapors naturally produce strong bipartite entanglement, which we explicitly quantify using the tools of quantum information science. This entanglement is shown to have a lifetime at least as long as the spin-exchange relaxation time, and to directly affect measurable spin noise observables. This is a formal theoretical demonstration that a hot and dense atomic vapor can support longlived bipartite and possibly higher-order entanglement.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2004.11790>)

[PDF](<https://arxiv.org/pdf/2004.11790.pdf>)