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 focus on two-dimensional systems and consider them both in equilibrium and under a uniform electric field. The signal is expected to be particularly pronounced 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. For completeness and comparison, we also present analogous results for one-dimensional wires.

Close

PrevNext

View figure in article

• Noise
• Superconducting fluctuations
• High-temperature superconductors
• Noise measurements
• Time-dependent Ginzburg-Landau theory