Phononic loss in superconducting resonators on piezoelectric substrates
Artikel i vetenskaplig tidskrift, 2020

We numerically and experimentally investigate the phononic loss for superconducting resonators fabricated on a piezoelectric substrate. With the help of finite element method simulations, we calculate the energy loss due to electromechanical conversion into bulk and surface acoustic waves. This sets an upper limit for the resonator internal quality factor Q i. To validate the simulation, we fabricate quarter wavelength coplanar waveguide resonators on GaAs and measure Q i as function of frequency, power and temperature. We observe a linear increase of Q i with frequency, as predicted by the simulations for a constant electromechanical coupling. Additionally, Q i shows a weak power dependence and a negligible temperature dependence around 10 mK, excluding two level systems and non-equilibrium quasiparticles as the main source of losses at that temperature.

Författare

Marco Scigliuzzo

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantteknologi

Laure Bruhat

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantteknologi

Andreas Bengtsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantteknologi

Jonathan Burnett

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantteknologi

National Physical Laboratory (NPL)

Anita Fadavi Roudsari

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantteknologi

Per Delsing

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantteknologi

New Journal of Physics

1367-2630 (ISSN)

Vol. 22 5 053027

Ämneskategorier

Atom- och molekylfysik och optik

Fusion, plasma och rymdfysik

Den kondenserade materiens fysik

DOI

10.1088/1367-2630/ab8044

Mer information

Senast uppdaterat

2020-07-20