Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout

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 inp...

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Bibliographic Details
Published inarXiv.org
Main Authors Ranzani, Leonardo, Bal, Mustafa, Kin Chung Fong, Ribeill, Guilhem, Wu, Xian, Long, Junling, Hsiang Sheng Ku, Erickson, Robert P, Pappas, David, Ohki, Thomas A
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 27.11.2018
Subjects
Broadband
Connectors
Dilution
Inductance
Noise
Physics - Quantum Physics
Quantum phenomena
Quantum theory
Qubits (quantum computing)
Scattering
Superconductivity
Switches
Traveling wave amplifiers
Traveling waves
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1809.11048