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  • Title: Implementation of the Dicke lattice model in hybrid quantum system arrays.
    Author: Zou LJ, Marcos D, Diehl S, Putz S, Schmiedmayer J, Majer J, Rabl P.
    Journal: Phys Rev Lett; 2014 Jul 11; 113(2):023603. PubMed ID: 25062180.
    Abstract:
    Generalized Dicke models can be implemented in hybrid quantum systems built from ensembles of nitrogen-vacancy (NV) centers in diamond coupled to superconducting microwave cavities. By engineering cavity assisted Raman transitions between two spin states of the NV defect, a fully tunable model for collective light-matter interactions in the ultrastrong coupling limit can be obtained. Our analysis of the resulting nonequilibrium phases for a single cavity and for coupled cavity arrays shows that different superradiant phase transitions can be observed using existing experimental technologies, even in the presence of large inhomogeneous broadening of the spin ensemble. The phase diagram of the Dicke lattice model displays distinct features induced by dissipation, which can serve as a genuine experimental signature for phase transitions in driven open quantum systems.
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