Quantum Heating of a Nonlinear Resonator Probed by a Superconducting Qubit

Abstract : 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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F.R. Ong, M. Boissonneault, A.C. Doherty, A Blais, P Bertet, et al.. Quantum Heating of a Nonlinear Resonator Probed by a Superconducting Qubit. Physical Review Letters, American Physical Society, 2013, 110, pp.047001. ⟨10.1103/PhysRevLett.110.047001⟩. ⟨cea-01477717⟩

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