K. Juliusson

Multiplexed Readout of Transmon Qubits with Josephson Bifurcation Amplifiers

  1. V. Schmitt,
  2. X. Zhou,
  3. K. Juliusson,
  4. A. Blais,
  5. P. Bertet,
  6. D. Vion,
  7. and D. Esteve
Achieving individual qubit readout is a major challenge in the development of scalable superconducting 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 an 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.
arxiv pdf