Light Effects on High Q-Resonators for Hybrid Quantum Systems

Full text: Over the last years hybrid quantum systems have drawn attention in the field of quantum information processing, because of their ability to combine the advantages of different quantum worlds (e.g. cold atoms, NV centers, superconducting Qubits...). The heart of these hybrid systems are superconducting microwave resonators with high quality factors (on the order of one million). The response of these resonators under the influence of light is very crucial, since many of the hybrid applications involve laser light with different intensity. We will present measurements of the shift of resonator frequency as a function of the applied light power. Furthermore, we show the effects on the Q value due to the generation of quasiparticles and the saturation of two-level fluctuators in the superconducting thin films. We will also put these facts in perspective with resent measurements of resonators strongly coupled to an ensemble of NV centers. (author)