University of Oulu

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

Flux-tunable heat sink for quantum electric circuits

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Author: Partanen, M.1; Tan, K. Y.1; Masuda, S.1;
Organizations: 1QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University
2National Institute of Standards and Technology
3VTT Technical Research Centre of Finland Ltd
4MSP group, QTF Centre of Excellence, Department of Applied Physics, Aalto University
5Nano and Molecular Systems Research Unit, University of Oulu
6Departments of Mathematical Sciences and Physics, Loughborough University
7Department of Physics, Brown University
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
Persistent link:
Language: English
Published: Springer Nature, 2018
Publish Date: 2018-08-07


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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Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Volume: 8
Article number: 6325
DOI: 10.1038/s41598-018-24449-1
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: 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.
Academy of Finland Grant Number: 251748
Detailed Information: 251748 (Academy of Finland Funding decision)
284621 (Academy of Finland Funding decision)
312059 (Academy of Finland Funding decision)
312300 (Academy of Finland Funding decision)
265675 (Academy of Finland Funding decision)
286215 (Academy of Finland Funding decision)
276528 (Academy of Finland Funding decision)
305237 (Academy of Finland Funding decision)
305306 (Academy of Finland Funding decision)
308161 (Academy of Finland Funding decision)
314302 (Academy of Finland Funding decision)
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