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This research presents a novel analytical framework that disentangles variable sensor coupling from genuine environmental noise in quantum ensembles. By utilizing dynamical decoupling measurements, the method enables accurate extraction of broadband noise spectra previously obscured by inhomogeneous sensitivity across diamond sensing arrays. This advancement significantly improves measurement sensitivity and field of view for characterizing magnetic phenomena without relying on single-sensor limits.

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Researchers Extract True Noise Spectra Via Coherence Measurements

Quantum ZeitgeistSeptember 23, 20263 min read

Until now, interpreting signals from groups of quantum sensors has been like trying to hear a whisper in a crowded room where everyone speaks at a different volume. This work disentangles those varying sensitivities, allowing accurate extraction of environmental noise spectra previously obscured by differing coupling within the ensemble itself. Achieving this unlocks potential gains in sensitivity and bandwidth across diverse systems, extending detection beyond single-sensor limits.

An analytical procedure using ensemble coherence from dynamical decoupling measurements accesses the true source noise spectrum when employing quantum sensors. Noise spectroscopy with quantum sensors is a strong tool for characterising sensor environments and identifying key magnetic phenomena. Replacing individual sensors with larger ensembles potentially improves measurement sensitivity and field of view, yet introduces challenges concerning interpretation because of variable…

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