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Achieving individual qubit readout is a major challenge in the development ofscalable superconducting quantum processors. We have implemented themultiplexed readout of a four transmon qubit circuit using non-linearresonators operated as Josephson bifurcation amplifiers. We demonstrate thesimultaneous measurement of Rabi oscillations of the four transmons. We findthat multiplexed Josephson bifurcation is a high-fidelity readout method, thescalability of which is not limited by the need of a large bandwidth nearlyquantum-limited amplifier as is the case with linear readout resonators.

Multiplexed Readout of Transmon Qubits with Josephson Bifurcation Amplifiers