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.

中文翻译：

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用于量子电路的通量可调散热器。


超导微波电路在量子信息处理等实际量子技术应用中显示出巨大的潜力。然而，这些设备中量子自由度的快速按需初始化仍然是一个挑战。在这里，我们实验性地实现了一个可调谐散热器，它可能适合超导量子位的初始化。我们的设备由两个耦合谐振器组成。第一谐振器具有高品质因数和固定频率，而第二谐振器被设计为具有低品质因数和可调谐谐振频率。我们使用片上电阻器设计低品质因数，并使用超导量子干涉器件设计频率可调性。当两个谐振器发生谐振时，高质量谐振器中的光子可以被有效地耗散。我们表明，在 10 GHz 时，相应的负载品质因数可以从 10 ⁵以上调整到几千，这与我们的理论模型在数量上具有良好的一致性。