Signatures of Gaussian superconducting fluctuations in nonlocal noise magnetometry

• URL: http://arxiv.org/abs/2605.18970v1
• Date: Mon, 18 May 2026 18:00:43 GMT
• Title: Signatures of Gaussian superconducting fluctuations in nonlocal noise magnetometry
• Abstract summary: We calculate the two-point magnetic noise spectrum arising from Gaussian superconducting fluctuations.<n>The signal is expected to be strongest in high-temperature superconductors.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We calculate the two-point magnetic noise spectrum arising from Gaussian superconducting fluctuations, a quantity directly measurable by spin qubit pairs such as nitrogen vacancy centers in diamond. The analysis utilizes the time-dependent Ginzburg-Landau theory, reflecting the direct contribution of fluctuating Cooper pairs to the current correlations and consequent magnetic noise. We treat both two-dimensional systems and wires, considering them in equilibrium and under a uniform electric field. The signal is expected to be strongest in high-temperature superconductors, and we contrast our findings with the predicted signatures of a vortex liquid to offer an additional route to elucidate the nature of fluctuations in these systems.

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