Compact and Tunable Forward Coupler Based on High-Impedance Superconducting Nanowires
Name
PhysRevApplied.15.024064.pdf
Description
Published version
Size
1.86 MB
Format
Adobe PDF
Checksum (MD5)
07a5fc209fed06fb846d0b6adeb8eb03
Author(s)
Colangelo, Marco
Zhu, Di
Santavicca, Daniel F
Butters, Brenden A
Bienfang, Joshua C
Berggren, Karl K
Date Issued
2021
Journal
Physical Review Applied
Publisher
American Physical Society (APS)
Citation
Colangelo, Marco, Zhu, Di, Santavicca, Daniel F, Butters, Brenden A, Bienfang, Joshua C et al. 2021. "Compact and Tunable Forward Coupler Based on High-Impedance Superconducting Nanowires." Physical Review Applied, 15 (2).
Version
Final published version
Abstract
© 2021 American Physical Society. Developing compact, low-dissipation, cryogenic-compatible microwave electronics is essential for scaling up low-temperature quantum computing systems. In this paper, we demonstrate an ultracompact 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 416μm2. At 4.753 GHz, the input signal couples equally to the through port and forward-coupling port (50:50) at -6.7dB with -13.5dB 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 processes are suitable for direct integration with superconducting circuits, providing a practical solution to the signal distribution bottlenecks in developing large-scale quantum computers.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PHYSREVAPPLIED.15.024064
