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arXiv 2005.05411physics.app-phcond-mat.mes-hall
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用于具有栅极限定量子点的高阻抗谐振器的片上微波滤波器

On-chip microwave filters for high-impedance resonators with gate-defined quantum dots

Patrick Harvey-Collard, Guoji Zheng, Jurgen Dijkema, Nodar Samkharadze, Amir Sammak, Giordano Scappucci, Lieven M. K. Vandersypen

发表信息：
Phys. Rev. Applied 14, 034025 (2020)
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摘要：

电路量子电动力学（QED）采用超导微波谐振器作为量子总线。在具有基于半导体量子点的量子比特的电路QED中，增加谐振器阻抗是期望的，因为它增强了与这些量子比特的通常小的电荷偶极矩的耦合。然而，在谐振器附近形成量子点所需的栅电极无意中导致微波光子可以通过其泄漏的寄生端口，从而降低谐振器的品质因数。对于高阻抗谐振器尤其如此，因为它们的总电容与寄生端口电容的比率较小，导致比50- $Ω$谐振器更大的微波泄漏。在这里，我们介绍了一种实现的片上滤波器，以抑制微波泄漏。该滤波器包括高动态电感纳米线电感器和薄膜电容器。该滤波器占地面积小，可以放置在谐振器附近，将微波限制在芯片的一个小区域内。滤波器元件的电感和电容可以在比其典型的螺旋电感器和叉指电容器对应物更宽的值范围内变化。我们证明，总线宽的6.4 GHz和约3-k $Ω$谐振器可以提高到540 kHz，使用这些滤波器。

英文摘要：

Circuit quantum electrodynamics (QED) employs superconducting microwave resonators as quantum buses. In circuit QED with semiconductor quantum-dot-based qubits, increasing the resonator impedance is desirable as it enhances the coupling to the typically small charge dipole moment of these qubits. However, the gate electrodes necessary to form quantum dots in the vicinity of a resonator inadvertently lead to a parasitic port through which microwave photons can leak, thereby reducing the quality factor of the resonator. This is particularly the case for high-impedance resonators, as the ratio of their total capacitance over the parasitic port capacitance is smaller, leading to larger microwave leakage than for 50-$Ω$ resonators. Here, we introduce an implementation of on-chip filters to suppress the microwave leakage. The filters comprise a high-kinetic-inductance nanowire inductor and a thin-film capacitor. The filter has a small footprint and can be placed close to the resonator, confining microwaves to a small area of the chip. The inductance and capacitance of the filter elements can be varied over a wider range of values than their typical spiral inductor and interdigitated capacitor counterparts. We demonstrate that the total linewidth of a 6.4 GHz and approximately 3-k$Ω$ resonator can be improved down to 540 kHz using these filters.

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