AIP Advances
(Dec 2011)
Thin-film superconducting resonator tunable to the ground-state hyperfine splitting of 87Rb
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
Affiliations
Z. Kim
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
C. P. Vlahacos
Center for Nanophysics and Advanced Materials, College Park, Maryland 20742, USA
J. E. Hoffman
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
J. A. Grover
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
K. D. Voigt
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
B. K. Cooper
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
C. J. Ballard
Trevecca Nazarene College, Nashville, Tennessee 37210, USA
B. S. Palmer
Laboratory for Physical Sciences, College Park, Maryland 20740, USA
M. Hafezi
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
J. M. Taylor
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
J. R. Anderson
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
A. J. Dragt
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
C. J. Lobb
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
L. A. Orozco
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
S. L. Rolston
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
F. C. Wellstood
Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
DOI
https://doi.org/10.1063/1.3651466
Journal volume & issue
Vol. 1,
no. 4
Abstract
Read online
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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