Superconducting microwave circuits show great potential for practical quantum technological applications such as quantum information processing. However, fast and on-demand initialization of the quantum degrees of freedom in these devices remains a challenge. Here, we experimentally implement a tunable heat sink that is potentially suitable for the initialization of superconducting qubits. Our device consists of two coupled resonators. The first resonator has a high quality factor and a fixed frequency whereas the second resonator is designed to have a low quality factor and a tunable resonance frequency. We engineer the low quality factor using an on-chip resistor and the frequency tunability using a superconducting quantum interference device. When the two resonators are in resonance, the photons in the high-quality resonator can be efficiently dissipated. We show that the corresponding loaded quality factor can be tuned from above 105 down to a few thousand at 10 GHz in good quantitative agreement with our theoretical model.
SormenjälkiSukella tutkimusaiheisiin 'Flux-tunable heat sink for quantum electric circuits'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.
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Keränen, A., Ma, J., Möttönen, M., Silveri, M., Tiurev, K., Girard, J., Gunyhó, A., Mäkinen, A., Tuorila, J., Mörstedt, T., Oinonen, N., Partanen, M., Kohvakka, K., Tuohino, S., Sah, A., Abuzaid, O., Blanchet, F. & Kivijärvi, H.
23/12/2016 → 31/12/2021
Projekti: EU: ERC grants