A Sub-GHz Impedance-engineered Parametric Amplifier for the Readout of Sensors and Quantum Dots

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In the work on superconducting parametric amplifiers, the frequency band below one gigahertz is calling for systematic improvements. Despite a prospect for ultralow added noise, bandwidth limitations have slowed down the integration of such amplifiers into sub-GHz experiments demanding fast ($< 1\, \mu$s) readout speeds. Here, we study the impedance engineering of a flux-driven Josephson parametric amplifier (JPA) at 600 MHz. We propose, simulate and experimentally demonstrate a partially reconfigurable impedance transformer. The transformer enhances the JPA bandwidth to a state-of-the-art value of 10 MHz at 20 dB gain. Our amplifier has immediate applications in the readout of cryogenic sensors and in the reflectometry of quantum dots for spin qubit quantum computing.

Original language English IEEE Transactions on Applied Superconductivity 32 4 7 Feb 2022 https://doi.org/10.1109/TASC.2022.3148965 Published - 1 Jun 2022 A1 Journal article-refereed

Keywords

• Bandwidth
• Impedance
• Inductance
• Microwave amplifiers
• quantum computing
• Quantum dots
• Resonators
• SQUIDs
• superconducting devices
• Transformers

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