2014/04/30 by A. Narla, K. M. Sliwa, M. Hatridge +4
Computer Science · Engineering · Physics and Astronomy · #Advanced Electrical Measurement Techniques #Physics of Superconductivity and Magnetism #Quantum Information and Cryptography #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1063/1.4883373
published as Applied Physics Letters, 104, 232605 (2014) · 6 pages, 4 figures
openalex publication_date 2014/06/09 · arxiv created 2014/07/21 · arxiv updated 2014/07/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Josephson junction parametric amplifiers are playing a crucial role in the readout chain in superconducting quantum information experiments. However, their integration with current 3D cavity implementations poses the problem of transitioning between waveguide, coax cables, and planar circuits. Moreover, Josephson amplifiers require auxiliary microwave components, like directional couplers and/or hybrids, that are sources of spurious losses and impedance mismatches that limit measurement efficiency and amplifier tunability. We have developed a wireless architecture for these parametric amplifiers that eliminates superfluous microwave components and interconnects. This greatly simplifies their assembly and integration into experiments. We present an experimental realization of such a device operating in the 9–11 GHz band with about 100 MHz of amplitude gain-bandwidth product, on par with devices mounted in conventional sample holders. The simpler impedance environment presented to the amplifier also results in increased amplifier tunability.