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Schematic of compact resonator and inset showing resonator parameters. The compact resonator is coupled inductively to the CPW feedline. The parameters indicated in the inset directly affect the participation of the insulator and metal surfaces to the reactive elements of the resonator.
Two extreme examples of resonator response curves fit with Eq. (1). Responses typically fall in between (a) symmetric and (b) strongly asymmetric about the resonant frequency.
Dependence of on parameter values. The changes in for a given mutant value are reported in reference to the average (160 000) of design A with positive values representing improvements. The shaded column indicates the design A value of that parameter; in this column is zero by definition. The square in each row with a bold border shows the value chosen for design B. Parameters for design C cannot easily be shown on this figure as explained in the main text.
Histograms of single-photon internal quality factors for designs A, B, and C resonators with ion-milling and designs A and B without ion-milling. Qi improves steadily from design A to B to C. For both designs A and B resonators, when ion-milling is not performed, is roughly a factor of four lower.
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