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      Cavity quantum electrodynamics in the nonperturbative regime

      , ,
      Physical Review A
      American Physical Society (APS)

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          The Dicke Quantum Phase Transition with a Superfluid Gas in an Optical Cavity

          A phase transition describes the sudden change of state in a physical system, such as the transition between a fluid and a solid. Quantum gases provide the opportunity to establish a direct link between experiment and generic models which capture the underlying physics. A fundamental concept to describe the collective matter-light interaction is the Dicke model which has been predicted to show an intriguing quantum phase transition. Here we realize the Dicke quantum phase transition in an open system formed by a Bose-Einstein condensate coupled to an optical cavity, and observe the emergence of a self-organized supersolid phase. The phase transition is driven by infinitely long-ranged interactions between the condensed atoms. These are induced by two-photon processes involving the cavity mode and a pump field. We show that the phase transition is described by the Dicke Hamiltonian, including counter-rotating coupling terms, and that the supersolid phase is associated with a spontaneously broken spatial symmetry. The boundary of the phase transition is mapped out in quantitative agreement with the Dicke model. The work opens the field of quantum gases with long-ranged interactions, and provides access to novel quantum phases.
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            Field Dependence of the Intrinsic Domain Magnetization of a Ferromagnet

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              Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box

              Under appropriate conditions, superconducting electronic circuits behave quantum mechanically, with properties that can be designed and controlled at will. We have realized an experiment in which a superconducting two-level system, playing the role of an artificial atom, is strongly coupled to a single photon stored in an on-chip cavity. We show that the atom-photon coupling in this circuit can be made strong enough for coherent effects to dominate over dissipation, even in a solid state environment. This new regime of matter light interaction in a circuit can be exploited for quantum information processing and quantum communication. It may also lead to new approaches for single photon generation and detection.
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                Author and article information

                Journal
                PLRAAN
                Physical Review A
                Phys. Rev. A
                American Physical Society (APS)
                2469-9926
                2469-9934
                April 2018
                April 11 2018
                : 97
                : 4
                Article
                10.1103/PhysRevA.97.043820
                653199ce-6bec-4f8b-ad34-e8bc732a2107
                © 2018

                https://link.aps.org/licenses/aps-default-license

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