Quantum well stabilized point defect spin qubits [article]

V. Ivády, J. Davidsson, A. L. Falk, P. V. Klimov, N. T. Son, D. D. Awschalom, I. A. Abrikosov, and Adam Gali V. Ivády, J. Davidsson, N. Delegan, A. L. Falk, P. V. Klimov (+8 others)
<span title="2019-09-27">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Defect-based quantum systems in in wide bandgap semiconductors are strong candidates for scalable quantum-information technologies. However, these systems are often complicated by charge-state instabilities and interference by phonons, which can diminish spin-initialization fidelities and limit room-temperature operation. Here, we identify a pathway around these drawbacks by showing that an engineered quantum well can stabilize the charge state of a qubit. Using density-functional theory and
more &raquo; ... erimental synchrotron x-ray diffraction studies, we construct a model for previously unattributed point defect centers in silicon carbide (SiC) as a near-stacking fault axial divacancy and show how this model explains these defect's robustness against photoionization and room temperature stability. These results provide a materials-based solution to the optical instability of color centers in semiconductors, paving the way for the development of robust single-photon sources and spin qubits.
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