  Superconducting parametric amplifiers play a crucial role in the preparation
and readout of quantum states at microwave frequencies, enabling high-fidelity
measurements of superconducting qubits. Most existing implementations of these
amplifiers rely on the nonlinearity from Josephson junctions, superconducting
quantum interference devices or disordered superconductors. Additionally,
frequency tunability arises typically from either flux or current biasing. In
contrast, semiconductor-based parametric amplifiers are tunable by local
electric fields, which impose a smaller thermal load on the cryogenic setup
than current and flux biasing and lead to vanishing crosstalk to other on-chip
quantum systems. In this work, we present a gate-tunable parametric amplifier
that operates without Josephson junctions, utilizing a proximitized
semiconducting nanowire. This design achieves near-quantum-limited performance,
featuring more than 20 dB gain and a 30 MHz gain-bandwidth product. The absence
of Josephson junctions allows for advantages, including substantial saturation
powers of -120dBm, magnetic field compatibility up to 500 mT and frequency
tunability over a range of 15 MHz. Our realization of a parametric amplifier
supplements efforts towards gate-controlled superconducting electronics,
further advancing the abilities for high-performing quantum measurements of
semiconductor-based and superconducting quantum devices.
