What is it about?
Reducing microwave loss by “surface engineering” can be a key enabler for pushing performance forward with devices of higher intrinsic quality factor. In this work, we have replaced the native oxide of Nb with an engineered oxide, using a process that leverages ANAB technology at 300 mm wafer scale.
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Why is it important?
A major roadblock to scalable quantum computing is phase decoherence and energy relaxation caused by qubits interacting with defect-related two-level systems (TLSs). Native oxides present on the surfaces of superconducting metals used in quantum devices are acknowledged to be a source of TLS that decrease qubit coherence times. Reducing microwave loss by “surface engineering” (i.e., replacing the uncontrolled native oxide of superconducting metals with a thin, stable surface with predictable characteristics) can be a key enabler for pushing performance forward with devices of higher intrinsic quality factor.
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This page is a summary of: Engineering of niobium surfaces through accelerated neutral atom beam technology for quantum applications, Journal of Applied Physics, July 2023, American Institute of Physics,
DOI: 10.1063/5.0153617.
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