Double-quantum spin-relaxation limits to coherence of near-surface nitrogen-vacancy centers

Abstract

We probe the relaxation dynamics of the full three-level spin system of near-surface nitrogen-vacancy (NV) centers in diamond to define a $T_1$ relaxation time that helps resolve the $T_2\le 2T_1$ coherence limit of the NV's subset qubit superpositions. We find that double-quantum spin relaxation via electric field noise dominates $T_1$ of near-surface NVs at low applied magnetic fields. Furthermore, we differentiate $1/f^{\alpha }$ spectra of electric and magnetic field noise using a novel noise-spectroscopy technique, with broad applications in probing surface-induced decoherence at material interfaces.

arXiv comment7 pages, 4 figures. Supplemental material 21 pages, 17 figures

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