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Noise properties of superconducting coplanar waveguide microwave resonators
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic illustration (not to scale) of the resonator and feedline geometry; See Day et al. (Ref. 2) for the equivalent circuit. Black represents the superconducting film and white represents bare substrate. The coupler relies on the mutual capacitance between the center strips of the feedline and resonator CPW lines and may be considered to be a lumped element , where is the coupling-limited quality factor. (b) Resonance circle of a Nb on Si resonator at (solid line), quasiparticle trajectory calculated from Mattis-Bardeen theory (Ref. 10) (dashed line). For this figure, the readout point is located at the resonance frequency . (c) Noise ellipse (magnified by a factor of 30). Other parameters are , (coupling limited), , , readout power , and internal power .

Image of FIG. 2.
FIG. 2.

Noise spectra in the phase [, solid line] and amplitude [, dashed line] directions, and the rotation angle [, dotted line]. The noise data are from the same resonator under the same condition as in Fig. 1. The inset shows the diagram of the homodyne readout system.

Image of FIG. 3.
FIG. 3.

Power and material dependence of the phase noise at . To compare resonators with different and , phase noise is converted to fractional frequency noise, calculated by . All the resonators have and and are measured around .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Noise properties of superconducting coplanar waveguide microwave resonators