Thin-film superconducting resonator tunable to the ground-state hyperfine splitting of ${}^{87}$Rb

Z. Kim, C. P. Vlahacos, J. E. Hoffman +13

We describe a thin-film superconducting Nb microwave resonator, tunable to within 0.3 ppm of the hyperfine splitting of ${}^{87}$Rb at $f_{Rb}=6.834683$ GHz. We coarsely tuned the re…