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The Japan Society of Applied Physics

Gain measurement of superconducting parametric amplifier using a coplanar-waveguide resonator

Ryōsuke Takahashi, Masanori Takeda, Hirotaka Terai

Published Jul 6, 2021• 0 citations
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Abstract We measured the microwave transmission characteristics of coplanar waveguides (CPWs) fabricated using YBa2Cu3O7−δ (YBCO) thin films with DC current biases. Kinetic inductances ( L K ) and nonlinear parameters ( I * ) were evaluated for CPWs with film thicknesses of 20, 50, and 200 nm. The results indicate that the experimental values closely follow the second-order nonlinearity exhibited by the L K . To operate as a superconducting parametric amplifier with a standard gain of 20 dB and a pump power of −10 dBm, we introduced a step-impedance structure into the transmission line. As a result, when using an MgO substrate, the required line length was estimated to be approximately 1.25 m, corresponding to approximately 29 times the wavelength of the CPW.