Mesoscopic Spin Coherence in a Disordered Dark Electron Spin Ensemble

• URL: http://arxiv.org/abs/2602.17074v1
• Date: Thu, 19 Feb 2026 04:32:51 GMT
• Title: Mesoscopic Spin Coherence in a Disordered Dark Electron Spin Ensemble
• Authors: Taewoong Yoon, Sangwon Oh, Junghyun Lee, Hyunyong Choi,
• Abstract summary: We report the observation of a coherent mesoscopic spin state in a disordered ensemble of substitutional nitrogen centers in diamond.<n>Results establish a foundation for utilizing dark electron spin ensembles as robust resources for quantum sensing and quantum many-body simulation.
• Score: 7.538776380975108
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Harnessing dipolar spin environments as controllable quantum resources is a central challenge in solid-state quantum technologies. Here, we report the observation of a coherent mesoscopic spin state in a disordered ensemble of substitutional nitrogen (P1) centers in diamond. An iterative Hartmann-Hahn protocol transfers polarization from dense nitrogen-vacancy (NV) centers to a P1 ensemble, yielding a 740-fold enhancement over room-temperature thermal equilibrium as revealed by differential readout. The resulting mesoscopic P1 spin ensemble exhibits collective Rabi oscillations and long-lived spin-lock and Hahn-echo coherences. We identify a crossover in the saturation polarization arising from the competition between coherent driving and local disorder, providing a quantitative measure of the system's intrinsic disorder. These results establish a foundation for utilizing dark electron spin ensembles as robust resources for quantum sensing and quantum many-body simulation.

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