Multiplexed readout of transmon qubits with Josephson bifurcation amplifiers

V Schmitt (1) , Xin Zhou (1) , K Juliusson (1) , D Blais (2, 3) , P Bertet (1) , D Vion (1) , D Esteve (1)

1 QUANTRONICS - Quantronics Group
2 CIFAR - Canadian Institute for Advanced Research
3 UdeS - Université de Sherbrooke

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.

Domaines: Physique [physics]

V Schmitt, Xin Zhou, K Juliusson, D Blais, P Bertet, et al.. Multiplexed readout of transmon qubits with Josephson bifurcation amplifiers. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2014, 90 (6), pp.62333. ⟨10.1103/PhysRevA.90.062333⟩. ⟨cea-01384732⟩