Parametric amplifier employing thin superconducting films

R. A. Connell

Alexei Kalabukhov, Michael A. Tarasov, Е. А. Степанцов +6 more

Boon-Kok Tan, Nikita S. Klimovich, Peter K. Day

Tokio Goto, Mahoto Takeda, Shingo Saito +1 more

A superconducting parametric amplifier is an electromagnetic wave amplifier with high-quality characteristics such as a wide bandwidth, an extremely low noise, and a high dynamic range. In this paper, we report on the estimations of a YBCO superconducting parametric amplifier characteristic. The YBCO thin films were deposited on an MgO substrate by a pulsed laser deposition method. Based on the measured YBCO thin film parameters, theoretical calculations were implemented for evaluations of kinetic inductance nonlinearities and parametric gains. The nonlinearity of the YBCO thin film was estimated to be stronger than a single crystal NbTiN thin film. It is indicated that the YBCO parametric amplifier has a potential to be realized the amplifier with the high parametric gain. It is also expected that it could be operated in the range of the high frequency band, at the high temperature, and low applied current.

P. Bura

N. I. Glushchuk, Vitaly M. Dmitriev, V. V. Onishchenko

The possibilities of using the nonlinear properties of thin superconducting films in parametric devices were investigated. The region of parametric amplification was calculated for a regenerative amplifier-converter, and it was found to be bounded on the low-frequency side by the inequality ..omega.. > ..omega../sub cr/ and on the high side by the condition that the process is adiabatic ..omega.. much < (k/h)(T/sub c/ - T). The optimal amplifier operating conditions were found.