Qubit readout using a double-pumped Josephson parametric amplifier operating above 20 GHz

Operating superconducting qubits at frequencies higher than typical cQED experiments (20 to 100 GHz) has been shown to reduce their sensitivity to thermal noise and also allows them to be operated at a higher temperature. In parallel with moving qubits to higher operating frequency, high frequency quantum-limited amplifiers will be necessary for performing efficient readout. Recently, we have demonstrated a nearly-quantum limited Al/AlOx four-wave mixing waveguide Josephson parametric amplifier (WJPA) operating above 20 GHz. Here, we study the dispersive readout of qubits above 20 GHz with a WJPA and will present an experimental optimization of fidelity and repeatability of readout.