Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-24449-1
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Funding
- European Research Council [278117, 681311]
- Academy of Finland through its Centres of Excellence Program [251748, 284621, 312059, 312298, 312300, 265675, 286215, 276528, 305237, 305306, 308161, 314302]
- Vilho, Yrjo and Kalle Vaisala Foundation
- Technology Industries of Finland Centennial Foundation
- Aatos Erkko Foundation
- Academy of Finland (AKA) [305306, 286215, 286215] Funding Source: Academy of Finland (AKA)
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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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