Superconducting Microstrip Resonator for Spin-Based Quantum Processor

We report the design and results of a novel superconducting microstrip line resonator for pulsed ESR experiments of thin films.~The resonator generates a homogeneous in-plane microwave magnetic field. This resonator consists of an array of superconducting half-wave microstrip transmission lines~to achieve high-Q resonance. They are driven via an in-phase splitter and so maintain a resonance at one single frequency. In addition the resonator has a relatively small mode. The performance, sensitivity and small mode volume are demonstrated through our observation of strong coupling and ESR spectroscopy.