Non-Gaussian Noise Magnetometry Using Local Spin Qubits Article Swipe

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Jonathan B. Curtis , Amir Yacoby , Eugene Demler ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2505.03877

Atomic scale qubits, as may be realized in nitrogen vacancy (NV) centers in diamond, offer the opportunity to study magnetic field noise with nanometer scale spatial resolution. Using these spin qubits, one can learn a great deal about the magnetic-field noise correlations, and correspondingly the collective-mode spectra, in quantum materials and devices. However, to date these tools have been essentially restricted to studying Gaussian noise processes -- equivalent to linear-response. In this work we will show how to extend these techniques beyond the Gaussian regime and show how to unambiguously measure higher-order magnetic noise cumulants in a local, spatially resolved way. We unveil two protocols for doing this; the first uses a single spin-qubit and different dynamical decoupling sequences to extract non-Markovian and non-Gaussian spin-echo noise. The second protocol uses two-qubit coincidence measurements to study spatially non-local cumulants in the magnetic noise. We then demonstrate the utility of these protocols by considering a model of a bath of non-interacting two-level systems, as well as a model involving spatially correlated magnetic fluctuations near a second-order Ising phase transition. In both cases, we highlight how this technique can be used to measure in a real many-body system how fluctuation dynamics converge towards the central limit theorem as a function of effective bath size. We then conclude by discussing some promising applications and extensions of this method.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2505.03877
PDF: https://arxiv.org/pdf/2505.03877
OA Status: green
OpenAlex ID: https://openalex.org/W4416011461

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DOI: https://doi.org/10.48550/arxiv.2505.03877

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Title: Non-Gaussian Noise Magnetometry Using Local Spin Qubits

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-05-06

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Authors: Jonathan B. Curtis, Amir Yacoby, Eugene Demler

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Landing page: https://arxiv.org/abs/2505.03877

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PDF URL: https://arxiv.org/pdf/2505.03877

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Cited by: 0

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