Characterization of Nb films for superconducting qubits using phase boundary measurements

Article Physics, Applied

TOF-SIMS analysis of decoherence sources in superconducting qubits

A. A. Murthy et al.

Summary: This study investigates the impacts of fabrication procedures on the dissipation mechanisms in superconducting qubits using time-of-flight secondary ion mass spectrometry. The results show that the formation of oxide and silicide regions and the incorporation of impurity species, such as niobium hydrides and carbides, affect the superconducting properties of the Nb thin film. It also reveals the presence of halogen species in the patterned thin films. Understanding the source of these impurities can contribute to intelligent fabrication of superconducting qubits and prolong coherence times.

APPLIED PHYSICS LETTERS (2022)

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Article Physics, Applied

Investigation of Microwave Loss Induced by Oxide Regrowth in High-Q Niobium Resonators

J. Verjauw et al.

Summary: The study reveals that reducing microwave loss in superconducting qubit devices can significantly improve performance through proper surface treatments. By removing oxides and limiting device exposure to air, microwave loss in resonators can be reduced by approximately an order of magnitude. Nb2O5 is identified as the primary surface oxide that grows significantly in the initial stages, with microwave losses scaling linearly with the thickness of Nb2O5.

PHYSICAL REVIEW APPLIED (2021)

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Article Materials Science, Multidisciplinary

Microscopic relaxation channels in materials for superconducting qubits

Anjali Premkumar et al.

Summary: By combining measurements of transmon qubit relaxation times (T-1) with spectroscopy and microscopy of polycrystalline niobium films, correlations were found between qubit coherence and intrinsic film properties such as grain size and surface oxide composition. This comprehensive approach enables a pathway for materials-driven improvements of superconducting qubit performance.

COMMUNICATIONS MATERIALS (2021)

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Article Physics, Applied