Power sensitivity of NV-based RF detectors scales inversely with the physical size of the RF-spin interface, reaching estimated limits of 10^{-20} W Hz^{-1} (slope) and 10^{-12} W Hz^{-1/2} (variance) under photon shot noise.
By loop antenna here, we refer to a coaxial cable or planar waveguide terminated in a single-turn omega loop, see Fig
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Power sensitivity of broadband radiofrequency detectors based on quantum diamond spins
Power sensitivity of NV-based RF detectors scales inversely with the physical size of the RF-spin interface, reaching estimated limits of 10^{-20} W Hz^{-1} (slope) and 10^{-12} W Hz^{-1/2} (variance) under photon shot noise.