量子线路中低损耗超导电感的实现
Implementation of low-loss superinductances for quantum circuits
摘要：
同时抑制电荷波动和偏移对于在利用超导相的大量子波动的设备中保持量子相干性是至关重要的。这需要具有极低DC和高RF阻抗的环境。这种环境由超电感提供，超电感被定义为零DC电阻电感，其阻抗在感兴趣的频率（1 - 10 GHz）处超过电阻量子$R_Q = h/(2e)^2 \simeq 6.5\ \mathrm{kΩ}$。此外，超电感必须具有尽可能小的耗散，并且具有远高于感兴趣频率的自谐振频率。约瑟夫森结阵列的动态电感是实现超导的理想候选者，只要它的相位滑移率足够低。我们成功地实现了这样的阵列使用大约瑟夫森结（$E_J >> E_C$），并测量内部损耗小于20 ppm，自谐振频率大于10 GHz，相位滑移率小于1 mHz。
英文摘要：
The simultaneous suppression of charge fluctuations and offsets is crucial for preserving quantum coherence in devices exploiting large quantum fluctuations of the superconducting phase. This requires an environment with both extremely low DC and high RF impedance. Such an environment is provided by a superinductance, defined as a zero DC resistance inductance whose impedance exceeds the resistance quantum $R_Q = h/(2e)^2 \simeq 6.5\ \mathrm{kΩ}$ at frequencies of interest (1 - 10 GHz). In addition, the superinductance must have as little dissipation as possible, and possess a self-resonant frequency well above frequencies of interest. The kinetic inductance of an array of Josephson junctions is an ideal candidate to implement the superinductance provided its phase slip rate is sufficiently low. We successfully implemented such an array using large Josephson junctions ($E_J >> E_C$), and measured internal losses less than 20 ppm, self-resonant frequencies greater than 10 GHz, and phase slip rates less than 1 mHz.
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