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arXiv · 1712.10256

Flux-tunable heat sink for quantum electric circuits

Matti Partanen·Kuan Yen Tan·Shumpei Masuda·Joonas Govenius·Russell E. Lake·Máté Jenei·Leif Grönberg·Juha Hassel·Slawomir Simbierowicz·Visa Vesterinen·Jani Tuorila·Tapio Ala-Nissila·Mikko Möttönen
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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 $10^5$ down to a few thousand at 10 GHz in good quantitative agreement with our theoretical model.

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Matti Partanen, Kuan Yen Tan, Shumpei Masuda, Joonas Govenius, Russell E. Lake, Máté Jenei, Leif Grönberg, Juha Hassel, Slawomir Simbierowicz, Visa Vesterinen, Jani Tuorila, Tapio Ala-Nissila, Mikko Möttönen. 2017-12-29. Flux-tunable heat sink for quantum electric circuits. https://arxiv.org/abs/1712.10256

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