Ultrastrong coupling phenomena beyond the Dicke model

Abstract

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.

arXiv comment11 pages, 8 figures

References in corpus (32)

• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• Charge insensitive qubit design derived from the Cooper pair box
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• Quantum state engineering with Josephson-junction devices
• The Dicke Quantum Phase Transition with a Superfluid Gas in an Optical Cavity
• Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
• Atomic physics and quantum optics using superconducting circuits
• Chaos and the Quantum Phase Transition in the Dicke Model
• A Superconducting Persistent Current Qubit
• Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime
• Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
• Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime
• Ultra-Strong Light-Matter Coupling Regime with Polariton Dots
• Coherent and Collective Quantum Optical Effects in Mesoscopic Systems
• Dynamical phase transition in the open Dicke model
• Is there a no-go theorem for superradiant quantum phase transitions in cavity and circuit QED ?
• Ultrastrong coupling regime of cavity QED with phase-biased flux qubits
• Light-matter decoupling in the deep strong coupling regime: The breakdown of the Purcell effect
• Superradiant Phase Transitions and the Standard Description of Circuit QED
• Realization of the Dicke model using cavity-assisted Raman transitions
• Implementation of a Quantum Metamaterial
• Vacuum degeneracy of a circuit-QED system in the ultrastrong coupling regime
• Nonequilibrium and nonperturbative dynamics of ultrastrong coupling in open lines
• Elimination of the A-square problem from cavity QED
• Super-radiant phase transition in superconducting circuit in thermal equilibrium
• Observation of collective coupling between an engineered ensemble of macroscopic artificial atoms and a superconducting resonator
• Quantum chaos and critical behavior on a chip
• Light-matter decoupling and $A^2$ term detection in superconducting circuits
• Origin and Implications of $A^2$-like Contribution in the Quantization of Circuit-QED Systems
• Depolarization shift of the superradiant phase transition
• Synchronized Switching in a Josephson Junction Crystal
• Electron-photon coupling in Mesoscopic Quantum Electrodynamics

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