Local Magnetometry from Measurement-Induced Dissipation
- URL: http://arxiv.org/abs/2601.08762v1
- Date: Tue, 13 Jan 2026 17:46:52 GMT
- Title: Local Magnetometry from Measurement-Induced Dissipation
- Authors: Rishith Reddy, Parveen Kumar, Ankur Das,
- Abstract summary: Many ordered states, including antiferromagnets and altermagnets, possess a vanishing net moment despite distinct local spin structure.<n>We show that such an order can be accessed through the measurement-induced steady state of a single primary qubit locally coupled to a spin lattice.
- Score: 0.688204255655161
- License: http://creativecommons.org/publicdomain/zero/1.0/
- Abstract: Magnetic phases are commonly identified through macroscopic magnetization, yet many ordered states, including antiferromagnets and altermagnets, possess a vanishing net moment despite distinct local spin structure. We show that such an order can be accessed through the measurement-induced steady state of a single primary qubit locally coupled to a spin lattice. Using a controlled primary-ancillary qubit protocol, we derive analytically that the steady state \emph{encodes} a locally weighted exchange field in a signed observable that is linear in the weak-coupling regime. Numerical simulations demonstrate lattice-scale resolution of antiferromagnetic and altermagnetic textures and robustness against short-correlated noise. Our results establish measurement-induced dissipation as a resource for detecting magnetic order through microscopic structure rather than through global moments.
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