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 |
|---|---|
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 32 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Jun 2022 |
| MoE publication type | A1 Journal article-refereed |
Funding
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).
Keywords
- Bandwidth
- Impedance
- Inductance
- Microwave amplifiers
- quantum computing
- Quantum dots
- Resonators
- SQUIDs
- superconducting devices
- Transformers