Document Type
Article
Publication Date
2024
DOI
10.1063/5.0226611
Publication Title
Applied Physics Letters
Volume
125
Issue
12
Pages
124002
Abstract
Niobium films are a key component in modern two-dimensional superconducting qubits, yet their contribution to the total qubit decay rate is not fully understood. The presence of different layers of materials and interfaces makes it difficult to identify the dominant loss channels in present two-dimensional qubit designs. In this paper, we present the study that directly correlates measurements of RF losses in such films to material parameters by investigating a high-power impulse magnetron sputtered (HiPIMS) film atop a three-dimensional niobium superconducting radio frequency (SRF) resonator. By using a 3D SRF structure, we are able to isolate the niobium film loss from other contributions. Our findings indicate that microwave dissipation in the HiPIMS-prepared niobium films, within the quantum regime, resembles that of record-high intrinsic quality factor of bulk niobium SRF cavities, with lifetimes extending into seconds. Microstructure and impurity level of the niobium film do not significantly affect the losses. These results set the scale of microwave losses in niobium films and show that niobium losses do not dominate the observed coherence times in present two-dimensional superconducting qubit designs, instead highlighting the dominant role of the dielectric oxide in limiting the performance. We can also set a bound for when niobium film losses will become a limitation for qubit lifetimes.
Rights
© 2024 The Authors. All rights reserved.
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in
Abdisatarov, B., Bafia, D., Murthy, A., Eremeev, G., Elsayed-Ali, H. E., Lee, J., Netepenko, A., Carlos, C. P. A., Leith, S., Rosaz, G. J., Romanenko, A., & Grassellino, A. (2024). Direct measurement of microwave loss in Nb films for superconducting qubits [Article]. Applied Physics Letters, 125(12), 1-6, Article 124002.
and may be found at https://doi.org/10.1063/5.0226611.
Data Availability
Article states: "The data that support the findings of this study are available from the corresponding author upon reasonable request."
Original Publication Citation
Abdisatarov, B., Bafia, D., Murthy, A., Eremeev, G., Elsayed-Ali, H. E., Lee, J., Netepenko, A., Carlos, C. P. A., Leith, S., Rosaz, G. J., Romanenko, A., & Grassellino, A. (2024). Direct measurement of microwave loss in Nb films for superconducting qubits. Applied Physics Letters, 125(12), 1-6, Article 124002. https://doi.org/10.1063/5.0226611
Repository Citation
Abdisatarov, B.; Bafia, D.; Murthy, A.; Eremeev, G.; Elsayed-Ali, H. E.; Lee, J.; Netepenko, A.; Carlos, C. P. A.; Leith, S.; Rosaz, G. J.; Romanenko, A.; and Grassellino, A., "Direct Measurement of Microwave Loss in Nb Films for Superconducting Qubits" (2024). Electrical & Computer Engineering Faculty Publications. 528.
https://digitalcommons.odu.edu/ece_fac_pubs/528
ORCID
0000-0002-1329-5018 (Elsayed-Ali)
Supplementary Materials
Included in
Electrical and Computer Engineering Commons, Engineering Physics Commons, Materials Science and Engineering Commons