Flux-pumped impedance-engineered broadband Josephson parametric amplifier

Journal Article · Mon Apr 05 00:00:00 UTC 2021 · Applied Physics Letters

DOI: https://doi.org/10.1063/5.0035945 · OSTI ID:1813121

Grebel, J.  ^[1]; Bienfait, A.  ^[2]; Dumur, É.  ^[3]; Chang, H. -S.  ^[1]; Chou, M. -H.  ^[1]; Conner, C. R.  ^[1]; Peairs, G. A.  ^[4]; Povey, R. G.  ^[1]; Zhong, Y. P.  ^[1]; Cleland, A. N.  ^[5]

---

1. Univ. of Chicago, IL (United States)
2. Univ. of Chicago, IL (United States); Univ. de Lyon (France); Univ. Claude Bernard, Lyon (France). Lab. de Physique
3. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States). Inst. for Molecular Engineering; Univ. Grenoble Alpes, Grenoble (France). CEA, INAC-Pheliqs, QuantECA
4. Univ. of Chicago, IL (United States); Univ. of California, Santa Barbara, CA (United States)
5. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States). Inst. for Molecular Engineering

Broadband quantum-limited amplifiers play a critical role in the single-shot readout of superconducting qubits, but a popular implementation, the traveling wave parametric amplifier, involves a complex design and fabrication process. Here, we present a simple design for a Josephson parametric amplifier, using a lumped element resonator comprising a superconducting quantum interference device whose useful bandwidth is enhanced with an on-chip impedance-matching circuit. Additionally, we demonstrate a flux-coupling geometry that maximizes the coupling to the Josepson loop and minimizes spurious excitation of the amplifier resonant circuit. The amplifier, which operates in a flux-pumped mode, is demonstrated with a power gain of more than 20dB over a bandwidth of about 300MHz, where approximate noise measurements indicate quantum-limited pehrformance. A procedure is given for optimizing the bandwidth for this kind of amplifier, using a linearized circuit simulation while minimizing non-linearities.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1813121
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 14 Vol. 118; ISSN 0003-6951
• Publisher: American Institute of Physics (AIP)Copyright Statement
• Country of Publication: United States
• Language: English