Wireless coupled Josephson parametric amplifier operated near 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 temperatures. In parallel with moving qubits to higher operating frequency, high frequency quantum-limited amplifiers will be necessary for performing efficient readout. However, the microwave design and packaging of devices is complex at higher frequencies because wirebonds and circuit boards introduce impedance mismatches, parasitic modes and microwave loss. To overcome this packaging challenge when scaling towards high frequencies, we present a wirelessly coupled resonant Josephson parametric amplifier (JPA). Our wireless design is demonstrated with an Al/AlOx Josephson junction-based, four-wave-mixing JPA that works around 20 GHz, but is compatible with other superconductor materials, junctions, and operating frequencies for higher temperature operation. We will discuss the circuit and package design, EM simulation, measurement setup and preliminary experimental results of this high frequency wireless JPA.