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Tunable superconducting microstrip resonators

Astghik Adamyan (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Andrey Danilov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Applied Physics Letters (0003-6951). Vol. 108 (2016), 17,
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2016-06-17. Senast ändrad 2016-07-06.
CPL Pubid: 237868

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik

Ämnesområden

Atom- och molekylfysik och optik

Chalmers infrastruktur

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