Josephson traveling-wave parametric amplifier based on low-intrinsic-loss coplanar lumped-element waveguide

• URL: http://arxiv.org/abs/2503.07559v2
• Date: Fri, 14 Mar 2025 12:13:41 GMT
• Title: Josephson traveling-wave parametric amplifier based on low-intrinsic-loss coplanar lumped-element waveguide
• Authors: C. W. Sandbo Chang, Arjan F. Van Loo, Chih-Chiao Hung, Yu Zhou, Christian Gnandt, Shuhei Tamate, Yasunobu Nakamura,
• Abstract summary: We present a Josephson traveling-wave parametric amplifier (JTWPA) based on a low-loss coplanar lumped-element waveguide architecture.<n>By employing open-stub capacitors and Manhattan-pattern junctions, our device achieves an insertion loss below 1 dB up to 12 GHz.
• Score: 4.691148074574096
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a Josephson traveling-wave parametric amplifier (JTWPA) based on a low-loss coplanar lumped-element waveguide architecture. By employing open-stub capacitors and Manhattan-pattern junctions, our device achieves an insertion loss below 1 dB up to 12 GHz. We introduce windowed sinusoidal modulation for phase matching, demonstrating that smooth impedance transitions effectively suppress intrinsic gain ripples. Using Tukey-windowed modulation with 8 % impedance variation, we achieve 20$-$23-dB gain over 5-GHz bandwidth under ideal matching conditions. In a more practical circuit having impedance mismatches, the device maintains 17$-$20-dB gain over 4.8-GHz bandwidth with an added noise of 0.13 quanta above standard quantum limit at 20-dB gain and $-99$-dBm saturation power, while featuring zero to negative backward gain below the bandgap frequency.

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