Optically addressable spin defects hosted in two-dimensional van der Waals materials represent a new frontier for quantum technologies, promising to lead to a new class of ultrathin quantum sensors and simulators. Recently, hexagonal boron nitride (hBN) has been shown to host several types of optically addressable spin defects, thus offering a unique opportunity to utilise various spin species in a single material. Here we demonstrate the co-existence of two separate spin species within a single hBN powder sample, namely boron vacancy defects and visible emitter spins. To identify the two spin species, we studied photoluminescence (PL) and optically detected magnetic resonance (ODMR) spectra for the as-received commercially sourced hBN powder and after electron irradiation. Further, we prepared a film of hBN powder on a test magnetic sample (a patterned CoFeB film with in-plane magnetization) and used the hBN spins to spatially map the sample’s stray magnetic field at room temperature.Our results establish hBN as a versatile platform for quantum technologies in a van der Waals host at room temperature.
Nitrogen Vacancy (NV) centers in diamond have emerged over the past few years as well-controlled quantum systems, with promising applications ranging from quantum information science to magnetic sensing. In this talk, I will describe new techniques for NV sensing – quantifying radical concentration and high-bandwidth compressed sensing.
First, I will present our diamond magnetic microscope, enabling high-sensitivity and high-resolution magnetic sensing. I will demonstrate a novel technique we developed to characterize radical concentrations through their effect on the NVs (in collaboration with Uri Banin’s group).
Then I will present a technique based on spectral compressed sensing, allowing high-bandwidth and large dynamic range magnetic sensing using NVs. We demonstrate the advantages of this approach and extend common compressed sensing schemes to practically “infinite resolution” in the frequency domain, further enhancing the the capabilities of our scheme.
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