Three-Dimensional Superconducting Resonators at T<20 mK with Photon Lifetimes up to τ=2 s

By A. Romanenko, R. Pilipenko, S. Zorzetti, D. Frolov, M. Awida, S. Belomestnykh, S. Posen, A. Grassellino. Physical Review Applied, 2018

163 citations recorded by the source corpus.

Very high quality factor superconducting radio frequency cavities developed for accelerators can enable fundamental physics searches with orders of magnitude higher sensitivity, as well as offer a path to a 1000-fold increase in the achievable coherence times for cavity-stored quantum states in the 3D circuit QED architecture. Here we report the first measurements of multiple accelerator cavities of $f_0=$1.3, 2.6, 5 GHz resonant frequencies down to temperatures of about 10~mK and field levels down to a few photons, which reveal record high photon lifetimes up to 2 seconds, while also further exposing the role of the two level systems (TLS) in the niobium oxide. We also demonstrate how the TLS contribution can be greatly suppressed by the vacuum heat treatments at 340-450$^\circ$C.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/5791ae76514c19bd4eed09a20a34ba2ec7841d3c

Citations in the corpus

• Systematic improvements in transmon qubit coherence enabled by niobium surface encapsulation (2023, unknown): “These previous measurements have unambiguously identi fi ed the surface oxide that forms spontaneously on Nb under ambient conditions as the major source of microwave loss 12,15 – 20 .”