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Título: | Ultrastrong coupling phenomena beyond the Dicke model |
Autor: | Jaako, Tuomas; Xiang, Ze-Liang; García-Ripoll, Juan José CSIC ORCID ; Rabl, Peter | Fecha de publicación: | 16-mar-2017 | Editor: | American Physical Society | Citación: | APS March Meeting 62: 4 (2017) | Resumen: | We study effective light-matter interactions in a circuit QED system consisting of a single LC resonator, which is coupled symmetrically to multiple superconducting qubits. Starting from a minimal circuit model, we demonstrate that in addition to the usual collective qubit-photon coupling the resulting Hamiltonian contains direct qubit-qubit interactions, which have a drastic effect on the ground and excited state properties of such circuits in the ultrastrong coupling regime. In contrast to a superradiant phase transition expected from the standard Dicke model, we find an opposite mechanism, which at very strong interactions completely decouples the photon mode and projects the qubits into a highly entangled ground state. These findings resolve previous controversies over the existence of superradiant phases in circuit QED, but they more generally show that the physics of two- or multi-atom cavity QED settings can differ significantly from what is commonly assumed. | Descripción: | APS March Meeting 2017, New Orleans, Louisiana, March 13–17, 2017. -- http://meetings.aps.org/Meeting/MAR17/Session/T1.7 | URI: | http://hdl.handle.net/10261/164445 |
Aparece en las colecciones: | (CFMAC-IFF) Comunicaciones congresos |
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