Tackling interface challenges for near-surface quantum emitters in diamond
Abstract: Spin defects in wide-bandgap semiconductors, such as color centers in diamond, can be highly sensitive to local (nanoscale) changes in magnetic field, temperature, and strain. These solid-state quantum sensors have certain advantages over their atomic counterparts owing to their room-temperature operation without the need for vacuum components and the relative ease of photonic- and RF-component integration. However, near-surface quantum defects exhibit spin decoherence and most of the light emitted is trapped within the bulk crystal due total internal reflection at the interface. I will summarize our recent work towards better understanding and addressing these interface challenges, including the modeling and experimental characterization of radiative emission of near-surface emitters, implementation of nanophotonic components to improve light extraction, and surface analysis and chemical termination techniques aimed at improving spin coherence of emitters.
Bio: Jennifer Choy is a Dugald C. Jackson Assistant Professor at the Department of Electrical and Computer Engineering at UW–Madison, where she focuses on quantum magnetometry and inertial sensing using neutral atoms and color centers in diamond. She was previously a Principal Member of Technical Staff at Draper Laboratory. She received S.B. degrees in Physics and Nuclear Engineering from the Massachusetts Institute of Technology, and a Ph.D. in Applied Physics from Harvard University.
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