Compact and Tunable Forward Coupler Based on High-Impedance Superconducting Nanowires
Compact and Tunable Forward Coupler Based on High-Impedance Superconducting Nanowires
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DOI：
10.1103/physrevapplied.15.024064
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
M. Colangelo;Di Zhu;D. Santavicca;B. Butters;J. Bienfang;K. Berggren
中科院分区：
文献类型：
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作者：
M. Colangelo;Di Zhu;D. Santavicca;B. Butters;J. Bienfang;K. Berggren
开发紧凑、低耗散、低温兼容的微波电子器件对于扩大低温量子计算系统至关重要。在本文中，我们展示了一种基于高阻抗慢波超导纳米线传输线的超紧凑微波定向前向耦合器。所制造器件的耦合部分的占地面积为 $416\,\mathrm{\mu m^2}$。在 4.753 GHz 时，输入信号以 $-6.7\,\mathrm{dB}$ 同等耦合到直通端口和正向耦合端口 (50:50)，隔离度为 $-13.5\,\mathrm{dB}$。通过利用动态电感对这些量的依赖性，可以利用直流偏置电流或温度来控制耦合比。该材料和制造工艺适合与超导电路直接集成，为开发大规模量子计算机的信号分配瓶颈提供了实用的解决方案。
Developing compact, low-dissipation, cryogenic-compatible microwave electronics is essential for scaling up low-temperature quantum computing systems. In this paper, we demonstrate an ultra-compact microwave directional forward coupler based on high-impedance slow-wave superconducting-nanowire transmission lines. The coupling section of the fabricated device has a footprint of $416\,\mathrm{\mu m^2}$. At 4.753 GHz, the input signal couples equally to the through port and forward-coupling port (50:50) at $-6.7\,\mathrm{dB}$ with $-13.5\,\mathrm{dB}$ isolation. The coupling ratio can be controlled with DC bias current or temperature by exploiting the dependence of the kinetic inductance on these quantities. The material and fabrication-process are suitable for direct integration with superconducting circuits, providing a practical solution to the signal distribution bottlenecks in developing large-scale quantum computers.