Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 29: Poster Session: Quantum Information Systems, Quantum Coherence (jointly with SAMOP)

TT 29.6: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Light Effects on High Q-Resonators for Hybrid Quantum Systems — •Christian Koller, Robert Amsüß, Tobias Nöbauer, Matthias Schramböck, Jörg Schmiedmayer, and Johannes Mayer — Atominstitut, TU Wien, Stadionalle 2, 1020 Wien, Österreich

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. A number of proposals for the combination of systems with long coherence times (e.g. atoms, cold molecules, nitrogen vacancies (NV) in diamond, ...) with solid-state systems featuring fast manipulation (e.g. Cooper-pair boxes, flux qubits, transmons, ...) have been made.

The heart of these hybrid systems are planar resonators with high quality factors (on the order of one million) formed by superconducting coplanar microwave transmission lines. The properties of these resonators under the influence of light is crucial, since many of the hybrid applications involve laser light, for example imaging and manipulation of cold atoms and molecules as well as the initialization and read-out of NV centers.

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 quasi particles 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.