Josephson traveling-wave parametric amplifier based on low-intrinsic-loss coplanar lumped-element waveguide
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909874312445952 |
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| author | Chang, C. W. Sandbo Van Loo, Arjan F. Hung, Chih-Chiao Zhou, Yu Gnandt, Christian Tamate, Shuhei Nakamura, Yasunobu |
| author_facet | Chang, C. W. Sandbo Van Loo, Arjan F. Hung, Chih-Chiao Zhou, Yu Gnandt, Christian Tamate, Shuhei Nakamura, Yasunobu |
| contents | 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 a smooth transition in the impedance-modulation strength effectively suppresses intrinsic gain ripples. Using Tukey-windowed modulation with 8\% impedance variation, we achieve 20\text{--}23-dB~gain over 5-GHz bandwidth under ideal matching conditions. In a more practical circuit having impedance mismatches, the device maintains 17\text{--}20-dB gain over 4.8-GHz bandwidth with an added noise of 0.18~quanta above standard quantum limit at 20-dB gain and $-99$-dBm saturation power, while featuring zero to negative backward gain below the band-gap frequency. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07559 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Josephson traveling-wave parametric amplifier based on low-intrinsic-loss coplanar lumped-element waveguide Chang, C. W. Sandbo Van Loo, Arjan F. Hung, Chih-Chiao Zhou, Yu Gnandt, Christian Tamate, Shuhei Nakamura, Yasunobu Applied Physics Quantum Physics 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 a smooth transition in the impedance-modulation strength effectively suppresses intrinsic gain ripples. Using Tukey-windowed modulation with 8\% impedance variation, we achieve 20\text{--}23-dB~gain over 5-GHz bandwidth under ideal matching conditions. In a more practical circuit having impedance mismatches, the device maintains 17\text{--}20-dB gain over 4.8-GHz bandwidth with an added noise of 0.18~quanta above standard quantum limit at 20-dB gain and $-99$-dBm saturation power, while featuring zero to negative backward gain below the band-gap frequency. |
| title | Josephson traveling-wave parametric amplifier based on low-intrinsic-loss coplanar lumped-element waveguide |
| topic | Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2503.07559 |