Flux-tunable heat sink for quantum electric circuits

M. Partanen (Corresponding Author), K.Y. Tan, S. Masuda, J. Govenius, R.E. Lake, M. Jenei, Leif Grönberg, Juha Hassel, Slawomir Simbierowicz, Visa Vesterinen, J. Tuorila, T. Ala-Nissilä, M. Möttönen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)


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.
Original languageEnglish
Article number 6325
Number of pages9
JournalScientific Reports
Publication statusPublished - 20 Apr 2018
MoE publication typeA1 Journal article-refereed


We acknowledge the provision of facilities and technical support by Aalto University at OtaNano - Micronova Nanofabrication Centre. We thank H. Grabert, M. Silveri, A. Wallraff, J. Kelly, J. Goetz and D. Hazra for discussions, and R. Kokkoniemi and S. Patomäki for technical assistance. We have received funding from the European Research Council under Starting Independent Researcher Grant No. 278117 (SINGLEOUT) and under Consolidator Grant No. 681311 (QUESS), the Academy of Finland through its Centres of Excellence Program (project nos 251748, 284621, 312059, 312298 and 312300) and grants (Nos. 265675, 286215, 276528, 305237, 305306, 308161 and 314302), the Vilho, Yrjö and Kalle Väisälä Foundation, the Technology Industries of Finland Centennial Foundation, and the Jane and Aatos Erkko Foundation.


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