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- W4224283921 abstract "Quantum information technology puts stringent demands on the quality of materials and interfaces in the pursuit of increased device coherence. Yet, little is known about the chemical structure and origins of paramagnetic impurities that produce flux/charge noise that causes decoherence of fragile quantum states and impedes the progress toward large-scale quantum computing. Here, we perform high magnetic field electron paramagnetic resonance (HFEPR) and hyperfine multispin spectroscopy on α-Al2O3, a common substrate for quantum devices. In its amorphous form, α-Al2O3 is also unavoidably present in aluminum-based superconducting circuits and qubits. The detected paramagnetic centers are immanent to the surface and have a well-defined but highly complex structure that extends over multiple hydrogen, aluminum, and oxygen atoms. Modeling reveals that the radicals likely originate from well-known reactive oxygen chemistry common to many metal oxides. We discuss how EPR spectroscopy might benefit the search for surface passivation and decoherence mitigation strategies." @default.
- W4224283921 created "2022-04-26" @default.
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- W4224283921 date "2022-04-08" @default.
- W4224283921 modified "2023-09-24" @default.
- W4224283921 title "On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al <sub>2</sub> O <sub>3</sub>" @default.
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- W4224283921 doi "https://doi.org/10.1126/sciadv.abm6169" @default.
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