Josephson parametric amplifiers for rapid, high-fidelity measurement of solid-state qubits

Josephson parametric amplifiers (JPAs) are crucial devices for readout of solid-state qubits. We review how to optimize the compression power and bandwidth of JPAs, necessary for realizing large-scale quantum information processors. We also discuss recent work to realize JPAs with a Josephson Junction Field Effect Transistor made from InAs-Al heterostructures.