Flux-pumped impedance-engineered broadband Josephson parametric amplifier

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 amplif...

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Bibliographic Details
Published in:Applied physics letters 2021-04, Vol.118 (14)
Main Authors: Grebel, J., Bienfait, A., Dumur, É., Chang, H.-S., Chou, M.-H., Conner, C. R., Peairs, G. A., Povey, R. G., Zhong, Y. P., Cleland, A. N.
Format: Article
Language:English
Subjects:
Amplifier design
Applied physics
Bandwidths
Broadband
Circuits
Coupling
Flux
Impedance matching
Parametric amplifiers
Power gain
Qubits (quantum computing)
Superconducting quantum interference devices
Superconductivity
Traveling waves
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Summary: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. We demonstrate a flux-coupling geometry that maximizes the coupling to the Josephson 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 20 dB over a bandwidth of about 300 MHz, where approximate noise measurements indicate quantum-limited performance. A procedure is given for optimizing the bandwidth for this kind of amplifier, using a linearized circuit simulation while minimizing non-linearities.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0035945