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

Visa Vesterinen, Slawomir Simbierowicz, Robab Najafi Jabdaraghi, Leif Gronberg, Janne S. Lehtinen, Mika Prunnila, Joonas Govenius

Research output: Contribution to journalArticleScientificpeer-review


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 languageEnglish
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - 1 Jun 2022
MoE publication typeA1 Journal article-refereed


Funding Information: This work was supported in part by the Academy of Finland through Grant 321700 and through its Centres of Excellence program under Grants 312059 and 312294, in part by EUFlagship on Quantum Technology under Grant H2020-FETFLAG-2018-03 through Projects 820363 OpenSuperQ and 820505 QMiCS, and in part by European Union?s Horizon 2020 Research and Innovation Programme under Grant agreement no. 824109 (European Microkelvin Platform project, EMP).


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


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