Flux-tunable heat sink for quantum electric circuits
Partanen, M.; Tan, K. Y.; Masuda, S.; Govenius, J.; Lake, R. E.; Jenei, M.; Grönberg, L.; Hassel, J.; Simbierowicz, S.; Vesterinen, V.; Tuorila, J.; Ala-Nissilä, T.; Möttönen, M. (2018-04-20)
Partanen, M., Tan, K., Masuda, S., Govenius, J., Lake, R., Jenei, M., Grönberg, L., Hassel, J., Simbierowicz, S., Vesterinen, V., Tuorila, J., Ala-Nissila, T., Möttönen, M. (2018) Flux-tunable heat sink for quantum electric circuits. Scientific Reports, 8 (1). doi:10.1038/s41598-018-24449-1
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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.
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