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- W3099791898 abstract "Nonequilibrium phase transitions exist in damped-driven open quantum systems when the continuous tuning of an external parameter leads to a transition between two robust steady states. In second-order transitions this change is abrupt at a critical point, whereas in first-order transitions the two phases can coexist in a critical hysteresis domain. Here, we report the observation of a first-order dissipative quantum phase transition in a driven circuit quantum electrodynamics system. It takes place when the photon blockade of the driven cavity-atom system is broken by increasing the drive power. The observed experimental signature is a bimodal phase space distribution with varying weights controlled by the drive strength. Our measurements show an improved stabilization of the classical attractors up to the millisecond range when the size of the quantum system is increased from one to three artificial atoms. The formation of such robust pointer states could be used for new quantum measurement schemes or to investigate multiphoton phases of finite-size, nonlinear, open quantum systems.Received 13 August 2016DOI:https://doi.org/10.1103/PhysRevX.7.011012Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFirst order phase transitionsJosephson effectLight-matter interactionOptical & microwave phenomenaOptical conductivityPhase transitionsQuantum description of light-matter interactionQuantum information with solid state qubitsQuantum opticsQuantum optics with artificial atomsQuantum phase transitionsSuperconductivityPhysical Systems0-dimensional systemsJunctionsNanostructuresSuperconductorsThin filmsTunnel junctionsTechniquesCryogenicsDilution refrigeratorDipole approximationEvaporationExact diagonalizationFilm depositionJaynes-Cummings modelJosephson junctionsLithographyMicrowave techniquesMonte Carlo methodsNumerical techniquesQuantum Monte CarloRotating wave approximationSQUIDSuperconducting devicesSuperconducting qubitsTavis-Cummings modelAtomic, Molecular & OpticalQuantum InformationCondensed Matter, Materials & Applied Physics" @default.
- W3099791898 created "2020-11-23" @default.
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- W3099791898 date "2017-01-31" @default.
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- W3099791898 title "Observation of the Photon-Blockade Breakdown Phase Transition" @default.
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- W3099791898 doi "https://doi.org/10.1103/physrevx.7.011012" @default.
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