Tunable superconducting microstrip resonators

Adamyan, Astghik, 1984 (author): Chalmers tekniska högskola,Chalmers University of Technology

Kubatkin, Sergey, 1959 (author): Chalmers tekniska högskola,Chalmers University of Technology

Danilov, Andrey, 1961 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

AIP Publishing, 2016
2016
English.
In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 108:17

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Abstract Subject headings

We report on a simple yet versatile design for a tunable superconducting microstrip resonator. Niobium nitride is employed as the superconducting material and aluminum oxide, produced by atomic layer deposition, as the dielectric layer. We show that the high quality of the dielectric material allows to reach the internal quality factors in the order of Q(i) similar to 10(4) in the single photon regime. Q(i) rapidly increases with the number of photons in the resonator N and exceeds 10(5) for N similar to 10 - 50. A straightforward modification of the basic microstrip design allows to pass a current bias through the strip and to control its kinetic inductance. We achieve a frequency tuning delta f = 62 MHz around f(0) = 2.4 GHz for a fundamental mode and delta f = 164MHz for a third harmonic. This translates into a tuning parameter Q(i)delta f/f(0) = 150. The presented design can be incorporated into essentially any superconducting circuitry operating at temperatures below 2.5K.

By the author/editor: Adamyan, Astghik ...; Kubatkin, Sergey ...; Danilov, Andrey, ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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