Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout

Abstract

We describe a kinetic inductance traveling-wave (KIT) amplifier suitable for superconducting quantum information measurements and characterize its wideband scattering and noise properties. We use mechanical microwave switches to calibrate the four amplifier scattering parameters up to the device input and output connectors at the dilution refrigerator base temperature and a tunable temperature load to characterize the amplifier noise. Finally, we demonstrate the high fidelity simultaneous dispersive readout of two superconducting transmon qubits. The KIT amplifier provides low-noise amplification of both readout tones with readout fidelities of 83% and 89% and negligible effect on qubit lifetime and coherence.

arXiv comment5 pages, 5 figures

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Cited by in corpus (25)

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• Kerr-free three-wave mixing in superconducting quantum circuits
• Perspective on traveling wave microwave parametric amplifiers
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• Characterizing cryogenic amplifiers with a matched temperature-variable noise source
• Three-wave mixing traveling-wave parametric amplifier with periodic variation of the circuit parameters
• Four wave-mixing in a microstrip kinetic inductance travelling wave parametric amplifier
• A 4-8 GHz Kinetic Inductance Travelling-Wave Parametric Amplifier Using Four-Wave Mixing with Near Quantum-Limit Noise Performance
• Anti-crosstalk high-fidelity state discrimination for superconducting qubits
• Characterization of NbTiN films with thicknesses below 20 nm for low power kinetic inductance amplifiers
• Kinetic inductance traveling wave amplifier designs for practical microwave readout applications
• Quantum analysis of second-order effects in superconducting travelling-wave parametric amplifiers
• Modeling and Harmonic Balance Analysis of Parametric Amplifiers for Qubit Read-out
• Fabrication of the impedance-matched Josephson parametric amplifier and the study of the gain profile
• Nonlinear characteristics of Ti, Nb, and NbN superconducting resonators for parametric amplifiers
• Zel'dovich amplification in a superconducting circuit
• An rf-SQUID-based traveling-wave parametric amplifier with -84 dBm input saturation power across more than one octave bandwidth
• Driving a Josephson Traveling Wave Parametric Amplifier into chaos: effects of a non-sinusoidal current-phase relation
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• Effect of 2${}^{\text{nd}}$ harmonic current--phase relation on a behavior of a Josephson Traveling Wave Parametric Amplifier
• Superconducting NbN Resonator Parametric Amplifiers for Millimetre Wavelengths