Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout
Leonardo Ranzani, Mustafa Bal, Kin Chung Fong, Guilhem Ribeill, Xian, Wu, Junling Long, Hsiang Sheng Ku, Robert P. Erickson, David Pappas, and, Thomas A. Ohki
TL;DR
This paper presents a kinetic inductance traveling-wave amplifier designed for superconducting quantum measurements, demonstrating high-fidelity qubit readout with minimal impact on qubit coherence.
Contribution
It introduces a new KIT amplifier with wideband, low-noise performance suitable for multiplexed qubit readout in quantum computing.
Findings
Achieved readout fidelities of 83% and 89%.
Demonstrated negligible effect on qubit lifetime and coherence.
Characterized amplifier's scattering and noise properties extensively.
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.
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