Chaos and the quantum phase transition in the Dicke model.
Clive Emary,Tobias Brandes +1 more
TLDR
A semiclassical Dicke model is derived that exhibits analogues of all the important features of the quantum model, such as the phase transition and the concurrent onset of chaos, and it is demonstrated that the system undergoes a transition from quasi-integrability to quantum chaotic.Abstract:
We investigate the quantum-chaotic properties of the Dicke Hamiltonian; a quantum-optical model that describes a single-mode bosonic field interacting with an ensemble of N two-level atoms. This model exhibits a zero-temperature quantum phase transition in the $\stackrel{\ensuremath{\rightarrow}}{N}\ensuremath{\infty}$ limit, which we describe exactly in an effective Hamiltonian approach. We then numerically investigate the system at finite N, and by analyzing the level statistics, we demonstrate that the system undergoes a transition from quasi-integrability to quantum chaotic, and that this transition is caused by the precursors of the quantum phase transition. Our considerations of the wave function indicate that this is connected with a delocalization of the system and the emergence of macroscopic coherence. We also derive a semiclassical Dicke model that exhibits analogues of all the important features of the quantum model, such as the phase transition and the concurrent onset of chaos.read more
Citations
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Quantum fluids of light
Iacopo Carusotto,Cristiano Ciuti +1 more
TL;DR: In this paper, a review of recent theoretical and experimental advances in the fundamental understanding and active control of quantum fluids of light in nonlinear optical systems is presented, from the superfluid flow around a defect at low speeds to the appearance of a Mach-Cherenkov cone in a supersonic flow, to the hydrodynamic formation of topological excitations such as quantized vortices and dark solitons at the surface of large impenetrable obstacles.
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Microwave photonics with superconducting quantum circuits
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Microwave photonics with superconducting quantum circuits
TL;DR: In the past 20 years, impressive progress has been made both experimentally and theoretically in superconducting quantum circuits, which provide a platform for manipulating microwave photons as mentioned in this paper, and many higher-order effects, unusual and less familiar in traditional cavity quantum electrodynamics with natural atoms, have been experimentally observed.
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Ultrastrong coupling between light and matter
TL;DR: A review of ultrastrong coupling between light and matter can be found in this paper, where the authors discuss entangled ground states with virtual excitations, new avenues for nonlinear optics, and connections to several important physical models.
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Keldysh field theory for driven open quantum systems.
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References
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Quantum chaos triggered by precursors of a quantum phase transition: the dicke model.
Clive Emary,Tobias Brandes +1 more