title: 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 amount of excitation of the intracavity field fluctuations, from which we infer its effective temperature. These quantities are found to be in agreement with theoretical predictions; in particular, we experimentally observe the phenomenon of quantum heating.
authors.affiliation: Quantronics group, Service de Physique de l'État Condensé (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France and Institute for Quantum Computing, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
authors.forename: F R
authors.initials: FR
authors.lastname: Ong
authors.affiliation: Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1 and Calcul Québec, Université Laval, Québec, Québec, Canada G1V 0A6.
authors.forename: M
authors.initials: M
authors.lastname: Boissonneault
authors.affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR 8551), Université Pierre et Marie Curie, 24, rue Lhomond, 75005 Paris, France.
authors.forename: F
authors.initials: F
authors.lastname: Mallet
authors.affiliation: Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia.
authors.forename: A C
authors.initials: AC
authors.lastname: Doherty
authors.affiliation: Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.
authors.forename: A
authors.initials: A
authors.lastname: Blais
authors.affiliation: Quantronics group, Service de Physique de l'État Condensé (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: D
authors.initials: D
authors.lastname: Vion
authors.affiliation: Quantronics group, Service de Physique de l'État Condensé (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: D
authors.initials: D
authors.lastname: Esteve
authors.affiliation: Quantronics group, Service de Physique de l'État Condensé (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: P
authors.initials: P
authors.lastname: Bertet