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

Abstract

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.

accepted in AIP Advances

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Cited by in corpus (11)

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• Quantum interface between an electrical circuit and a single atom
• Inhomogeneous broadening of optical transitions of 87Rb atoms in an optical nanofiber trap
• Sensitivity of ultracold atoms to quantized flux in a superconducting ring
• Adjusting the left-handedness in a cold ${}^{87}$Rb atom via multiple parameter modulation
• The design of an experimental platform for hybridization of atomic and superconducting quantum systems
• Protection layers on a superconducting microwave resonator toward a hybrid quantum system