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

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PHYSICAL REVIEW APPLIED
卷 13, 期 3, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.13.034032

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  1. United States Department of Energy [DE-AC02-07CH11359]
  2. U.S. Department of Energy, Office of High Energy Physics

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Very-high-quality-factor superconducting radio-frequency cavities developed for accelerators can enable fundamental physics searches with orders of magnitude higher sensitivity, and they can also offer a path to a 1000-fold increase in the achievable coherence times for cavity-stored quantum states in three-dimensional circuit QED architecture. Here we report measurements of multiple accelerator cavities of resonant frequencies of f(0) = 1.3, 2.6, 5 GHz down to temperatures of about 10 mK and field levels down to a few photons, which reveal very long photon lifetimes up to 2 s, while also further exposing the role of the two-level systems (TLS) in niobium oxide. We also demonstrate how the TLS contribution can be greatly suppressed by vacuum heat treatments at 340-450 degrees C.

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