Flux-tunable heat sink for quantum electric circuits

Aalto Quantum Physics Seminar (Nanotalo). Speaker: Mr. Matti Partanen (QCD, Aalto University, Finland).

In the framework of circuit quantum electrodynamics, we experimentally demonstrate a flux-tunable environment that can potentially be used for qubit initialization. Our system consists of two coupled resonators: one with a high quality factor, and the other with a low quality factor and a tunable resonance frequency achieved with a superconducting quantum interference device. We can tune the loaded quality factor of the system from above 10^5 down to a few thousand in good quantitative agreement with our model.