Josephson traveling-wave parametric amplifier based on a low-intrinsic-loss lumped-element coplanar waveguide
C.W. Sandbo Chang, Arjan F. Van Loo, Chih-Chiao Hung, Yu Zhou, Christian Gnandt, Shuhei Tamate, Yasunobu Nakamura
DOI 10.1103/qhl6-cz2z · Physical Review Applied
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We present a Josephson traveling-wave parametric amplifier (JTWPA) based on a low-loss lumped-element coplanar 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 20–23-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 0.18 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Fabrication of low-loss Josephson parametric devices
similarity 0.95K. E. Honasoge et al.
Source status unknown — claims are unverified
Nondegenerate Parametric Amplifiers Based on Dispersion-Engineered Josephson-Junction Arrays
similarity 0.95Patrick Winkel et al.
Source status unknown — claims are unverified
Hysteretic Flux Response and Nondegenerate Gain of Flux-Driven Josephson Parametric Amplifiers
similarity 0.94Stefan Pogorzalek et al.
Source status unknown — claims are unverified
Observing parity-time symmetry breaking in a Josephson parametric amplifier
similarity 0.93Chandrashekhar Gaikwad et al.
Source status unknown — claims are unverified
Magnetic field dependence of a Josephson traveling-wave parametric amplifier and integration into a high-field setup
similarity 0.93L.M. Janssen et al.
Source status unknown — claims are unverified
Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions
similarity 0.93H. Kamata et al.
Source status unknown — claims are unverified