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Multiplexed readout of transmon qubits with Josephson bifurcation amplifiers

V Schmitt 1 X Zhou 1 K Juliusson 1 D Blais 2, 3 P Bertet 1 D Vion 1 D Esteve 1
1 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : Achieving individual qubit readout is a major challenge in the development of scalable supercon-ducting quantum processors. We have implemented the multiplexed readout of a four transmon qubit circuit using non-linear resonators operated as Josephson bifurcation amplifiers. We demonstrate the simultaneous measurement of Rabi oscillations of the four transmons. We find that multiplexed Josephson bifurcation is a high-fidelity readout method, the scalability of which is not limited by the need of a large bandwidth nearly quantum-limited amplifier as is the case with linear readout resonators.
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V Schmitt, X Zhou, K Juliusson, D Blais, P Bertet, et al.. Multiplexed readout of transmon qubits with Josephson bifurcation amplifiers. Physical Review A, American Physical Society, 2014, 90 (6), pp.62333. ⟨10.1103/PhysRevA.90.062333⟩. ⟨cea-01384732⟩

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