Disentangling losses in tantalum superconducting circuits

KD Crowley, RA McLellan, A Dutta, N Shumiya… - Physical Review X, 2023 - APS
Superconducting qubits are a leading system for realizing large-scale quantum processors,
but overall gate fidelities suffer from coherence times limited by microwave dielectric loss …

Near-field localization of the boson peak on tantalum films for superconducting quantum devices

X Guo, Z Degnan, JA Steele, E Solano… - The Journal of …, 2023 - ACS Publications
Superconducting circuits are among the most advanced quantum computing technologies;
however, their performance is limited by losses found in surface oxides and disordered …

Microwave characterization of tantalum superconducting resonators on silicon substrate with niobium buffer layer

Y Urade, K Yakushiji, M Tsujimoto, T Yamada… - APL Materials, 2024 - pubs.aip.org
Tantalum thin films sputtered on unheated silicon substrates are characterized with
microwaves at around 10 GHz in a 10 mK environment. We show that the phase of tantalum …

Grain size in low loss superconducting Ta thin films on c axis sapphire

SG Jones, N Materise, KW Leung, JC Weber… - Journal of Applied …, 2023 - pubs.aip.org
In recent years, the implementation of thin-film Ta has led to improved coherence times in
superconducting circuits. Efforts to further optimize this materials set have become a focus of …

[HTML][HTML] Characterization of process-related interfacial dielectric loss in aluminum-on-silicon by resonator microwave measurements, materials analysis, and imaging

L Chayanun, J Biznárová, L Zeng, P Malmberg… - APL Quantum, 2024 - pubs.aip.org
We systematically investigate the influence of the fabrication process on dielectric loss in
aluminum-on-silicon superconducting coplanar waveguide resonators with internal quality …

Stable and low loss oxide layer on α-Ta (110) film for superconducting qubits

Z Ding, B Zhou, T Wang, L Yang, Y Wu, X Cai… - Journal of Vacuum …, 2024 - pubs.aip.org
The presence of amorphous oxide layers can significantly affect the coherent time of
superconducting qubits due to their high dielectric loss. Typically, the surface oxides of …

Conductivity freeze-out in isotopically pure -28 at millikelvin temperatures

BT McAllister, ZC Zhao, JF Bourhill, M Goryachev… - Physical Review …, 2024 - APS
Silicon is a key semiconducting material for electrical devices and hybrid quantum systems
where low temperatures and zero-spin isotopic purity can enhance quantum coherence …

Cryogenic growth of tantalum thin films for low-loss superconducting circuits

TAJ van Schijndel, AP McFadden, AN Engel… - arXiv preprint arXiv …, 2024 - arxiv.org
Motivated by recent advancements highlighting Ta as a promising material in low-loss
superconducting circuits and showing long coherence times in superconducting qubits, we …

Tantalum thin films sputtered on silicon and on different seed layers: material characterization and coplanar waveguide resonator performance

M Singer, B Schoof, H Gupta, D Zahn, J Weber… - arXiv preprint arXiv …, 2024 - arxiv.org
Superconducting qubits are a promising platform for large-scale quantum computing.
Besides the Josephson junction, most parts of a superconducting qubit are made of planar …