Temperature dependence of metrological sensitivities of nitrogen-vacancy centers in diamond

Fluorescence count rate, spin state fluorescence contrast and spin coherence times are key parameters determining the metrological sensitivity of NV centres in diamond, as well as their applicability in quantum information processing applications [1-2]. These parameters are well studied at room and low temperatures (~ 4 K ). However, understanding how they vary between 100 - 4 K has important implications on utilising NVs to study material systems which display key phase transitions in this intermediate temperature regime [3]. We present a temperature dependent study of how these parameters vary in near surface ensembles and single NVs.

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[2] J. O’Gorman. et al. A silicon-based surface code quantum computer. npj Quantum Inf 2, 15019 (2016).

[3] Nathan J. McLaughlin et al ‘Strong Correlation Between Superconductivity and Ferromagnetism in an Fe-Chalcogenide Superconductor’ Nano Letters 21 (17), 7277-7283  (2021)