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

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

2011-09-23

arxiv.org/abs/1109.5205v1

Physics

Quantum Physics

accepted in AIP Advances

Scientific paper

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 resonator using electron-beam lithography, decreasing the resonance frequency from 6.8637 GHz to 6.8278 GHz. For \emph{in situ} fine tuning at 15 mK, the resonator inductance was varied using a piezoelectric stage to move a superconducting pin above the resonator. We found a maximum frequency shift of about 8.7 kHz per 60-nm piezoelectric step and a tuning range of 18 MHz.

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