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Nitrogen-vacancy centers in diamond are attractive as quantum sensors owingto their remarkable optical and spin properties under ambient conditions. Herewe experimentally demonstrated a hybrid fiber-based thermometer coupled withnitrogen-vacancy center ensemble and a permanent magnet, where the temperaturesensitivity was improved by converting the temperature variation to themagnetic field change based on the thermal-demagnetization of the permanentmagnet. We have achieved both large temperature working range (room temperatureto 373 K) and millikelvin sensitivity (1.6 mK/sqrt(Hz)), nearly 6-foldimprovement compared with conventional technique. This stable and compacthybrid thermometer will enable a wide range of applications for large-areadetection and imaging with high temperature sensitivity.

Thermal-demagnetization-enhanced hybrid fiber-based thermometer coupled with nitrogen-vacancy centers