Quantum Heating of a nonlinear resonator probed by a superconducting qubit

  1. F. R. Ong,
  2. M. Boissonneault,
  3. F. Mallet,
  4. A. C. Doherty,
  5. A. Blais,
  6. D. Vion,
  7. D. Esteve,
  8. and P. Bertet
We measure the quantum fluctuations of a pumped nonlinear resonator, using a superconducting artificial atom as an in-situ probe. The qubit excitation spectrum gives access to the frequency and temperature of the intracavity field fluctuations. These are found to be in agreement with theoretical predictions; in particular we experimentally observe the phenomenon of quantum heating.
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