# Quantum trajectories in spin-exchange collisions reveal the nature of spin-noise correlations in multi-species alkali vapors

Source: [Quantum trajectories in spin-exchange collisions reveal the nature of spin-noise correlations in multi-species alkali vapors](<https://www.sota2.com/research/paper/68fa3ac11e209131ce8cd58f>)

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

Data updated: 2025-10-25T00:14:45.583Z

Authors: K. Mouloudakis, M. Loulakis, I. K. Kominis

Published: 2019-08-14T16:11:46.000Z

## Abstract

Spin-exchange collisions in alkali vapors have been at the basis of several fundamental and applied investigations, like nuclear structure studies and tests of fundamental symmetries, ultra-sensitive atomic magnetometers, magnetic resonance and bio-magnetic imaging. Spin-exchange collisions cause loss of spin coherence, and concomittantly produce spin noise, both phenomena being central to quantum metrology. We here develop the quantum trajectory picture of spin-exchange collisions, consistent with their long-standing ensemble description using density matrices. We then use quantum trajectories to reveal the nature of spin-noise correlations that spontaneously build up in multi-species atomic vapors, frequently utilized in the most sensitive spin measurements.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1908.05194>)

[PDF](<https://arxiv.org/pdf/1908.05194.pdf>)