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Open Quantum Systems Decoherence Quantum Simulation Quantum Thermodynamics

Dynamics of ideal quantum measurement of a spin 1 with a Curie-Weiss magnet

arXiv

Authors: Theodorus Maria Nieuwenhuizen

Year

2026

Paper ID

28655

Status

Preprint

Abstract Read

~2 min

Abstract Words

108

Citations

N/A

Abstract

Quantum measurement is a dynamical process of an apparatus coupled to a test system. Ideal measurement of the z-component of a spin-frac{1}{2} $s_z=pmfrac{1}{2}$ has been modeled by the Curie-Weiss model for quantum measurement. Recently, the model was generalized to higher spin and the thermodynamics was solved. Here the dynamics is considered. To this end, the dynamics for spin-frac{1}{2} case are cast in general notation. The dynamics of the measurement of the z-component of a spin-1 $s_z=0,pm 1$ are solved in detail and evaluated numerically. Energy costs of the measurement, which are macroscopic, are evaluated. Generalization to higher spin is straightforward.

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This paper contributes to the Quantum Simulation research area in the Quantum Articles archive.
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Quantum measurement is a dynamical process of an apparatus coupled to a test system.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2603.07153 [2] arXiv https://arxiv.org/abs/2603.07153 [3] Publisher https://arxiv.org/abs/2603.07153

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