We present a SNAIL-based parametric amplifier that integrates a lumped-element impedance matching network for increased bandwidth and an on-chip pump-port filter for efficient pump delivery. The amplifier is fabricated using a single-layer optical lithography step, followed by a single-layer electron-beam-lithography step. We measure a flat 20-dB gain profile with less than 1-dB ripple across a bandwidth of up to 250 MHz on multiple devices, demonstrating robust performance against variations arising from fabrication and packaging. We characterize the amplifier’s linearity by analyzing gain compression and intermodulation distortion under simultaneous multi-tone excitation. We show that the intermodulation products remain suppressed by more than 23 dB relative to the signal tones, even at the 1-dB gain compression point. We further validate its utility by performing simultaneous high-fidelity readout of two transmon qubits, achieving state assignment fidelities of $99.51\mathrm{\%}$ and $98.55\mathrm{\%}$. The combination of compact design, fabrication simplicity, and performance robustness makes this amplifier a practical device for quantum experiments with superconducting circuits.

Close

PrevNext

View figure in article

• Circuit quantum electrodynamics
• Quantum information with solid state qubits
• Superconducting quantum optics
• Multiplexers
• Optical parametric oscillators & amplifiers
• Superconducting devices
• Microwave techniques
• Superconducting RF