Flux-tunable heat sink for quantum electric circuits

Published

April 20, 2018

Author(s)

Matti Partanen, K-Y Tan, S Masuda, Joonas Govenius, Russell Lake, Mate Jenei, Leif Gronberg, Juha Hassel, S Simbierowicz, Visa Vesterinen, J Tuorila, T Ala-Nissila, Mikko Mottonen

Abstract

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.

Citation

Nature - Scientific Reports

Volume

8

Pub Type

Journals

Download Paper

https://doi.org/10.1038/s41598-018-24449-1

Local Download

Keywords

quantum technological applications, microwave circuits, quantum technology, superconducting, high quality factor, fixed frequency, low quality factor, tunable resonance frequency, on-chip resistor, superconducting quantum interference device, photons

Citation

Partanen, M. , Tan, K. , Masuda, S. , Govenius, J. , Lake, R. , Jenei, M. , Gronberg, L. , Hassel, J. , Simbierowicz, S. , Vesterinen, V. , Tuorila, J. , Ala-Nissila, T. and Mottonen, M. (2018), Flux-tunable heat sink for quantum electric circuits, Nature - Scientific Reports, [online], https://doi.org/10.1038/s41598-018-24449-1, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=924958 (Accessed October 15, 2025)