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A small footprint travelling-wave parametric amplifier with a high Signal-to-Noise Ratio improvement in a wide band
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We characterise a small footprint travelling-wave parametric amplifier (TWPA). The TWPA is built with magnetically flux-tunable superconducting nonlinear asymmetric inductive elements (SNAILs) and parallel-plate capacitors. It implements three-wave mixing (3WM) with resonant phase matching (RPM), a small cutoff frequency for high gain per unitcell and impedance matching networks for large bandwidth impedance matching. The device has 200 unitcells and a physical footprint of only 1.1 mm^2, yet demonstrates an average parametric gain of 19 dB over a 3 GHz bandwidth, an average effective signal-to-noise ratio improvement of 10 dB and a clear speedup of qubit readout time.
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Cited by 1 Pith paper
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Kinetic Inductance Traveling Wave Parametric Amplifiers Near the Quantum Limit: Methodology and Characterization
Kinetic inductance traveling wave parametric amplifiers made from 10 nm NbTiN films reach 1.1 quanta excess noise, over 25 dB gain, and multi-GHz bandwidth without magnetic shielding.
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