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Thin-film superconducting resonator tunable to the ground-state hyperfine splitting of 87Rb

Author(s): Z. Kim | C. P. Vlahacos | J. E. Hoffman | J. A. Grover | K. D. Voigt | B. K. Cooper | C. J. Ballard | B. S. Palmer | M. Hafezi | J. M. Taylor | J. R. Anderson | A. J. Dragt | C. J. Lobb | L. A. Orozco | S. L. Rolston | F. C. Wellstood

Journal: AIP Advances
ISSN 2158-3226

Volume: 1;
Issue: 4;
Start page: 042107;
Date: 2011;
Original page

We describe a thin-film superconducting Nb microwave resonator, tunable to within 0.3 ppm of the hyperfine splitting of 87Rb at fRb = 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 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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