Fast Tunable High- Q -Factor Superconducting Microwave Resonators

Tunable Superconducting Split Ring Resonators

High-Q Tunable Microwave Cavity Resonators and Filters using SOI-based RF MEMS Tuners

This paper presents the modeling, design, fabrication and measurement of MEMS-enabled continuously tunable evanescent-mode electromagnetic cavity resonators and filters with very high unloaded quality factors (Qu). Integrated electrostatically-actuated thin diaphragms are used for the first time for tuning the frequency of the resonators/filters. An example tunable resonator with 2.6:1 (5.0 − 1...

Microwave Intermodulation in High-Tc Superconducting Microstrip Resonators

|We present experimental results on microwave intermodulation measurements on a High Tc Superconducting band-reject microstrip resonator which exhibits unconventional 2:1 intermodulation products. We discuss unusual features of this 2:1 behavior that are uncovered by detailed frequency swept and unbalanced power measurements. We also introduce a phenomenological theory which arises from a nonli...

Quasiparticle relaxation in optically excited high-Q superconducting resonators.

The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response of the complex conductivity to photon flux. For tantalum and aluminum, chosen for their difference in electron-phonon coupling strength, we find that at high temperatures the relaxation time increases with decreasing temperature, as expected for electron-phonon interactio...

Fast-tunable resonators and quantum electrical circuits

In this thesis, measurements on superconducting electrical circuits that exhibit quantum mechanical effects are presented. Nonlinear superconducting circuits can be regarded as artificial atoms with energy spectra that can be engineered. The artificial atoms can be used as quantum bits for quantum computation. By coupling the artificial atoms to the electromagnetic field inside a transmission l...