10:30 〜 10:45
▲ [15a-D61-6] Parametric Amplification in a Superconducting Microstrip Transmission Line
キーワード：Parametric amplifier, Superconducting microstrip line
Broadband parametric amplifiers, which utilize the nonlinear kinetic inductance of superconducting transmission lines, provide a new access to ultimate sensing capability for radio astronomical observation and microwave quantum electronics. In this study, the behaviors of the electromagnetic wave propagation in non-linear superconducting transmission lines are investigated with a time-domain simulation method. The results present direct images of the travelling waves, which clarify the distinctively different features of the parametric gain in uniform and impedance-perturbed nonlinear transmission lines. In the experimental part of this work, we tested, for the first time, microstrip travelling wave parametric amplifiers based on NbTiN. A parametric gain was observed at liquid helium temperature.