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The Basic Formalism of Field Theory
Published in A.N. Vasiliev, Patricia A. Millard, Functional Methods in Quantum Field Theory and Statistical Physics, 2019
A.N. Vasiliev, Patricia A. Millard
This interaction involves a complex field ψ, ψ+, which can be either a bosonic or a fermionic field, and a real bosonic field φ. The interaction is written in cubic form () iSv(ψ+,ψ,φ)=∭dxdx′dyψ+(x)Γ(x,x′,y)ψ(x′)φ(y),
Basics of Social Lasing
Published in Andrei Khrennikov, Social Laser, 2020
Thus, in a quantum Bosonic field, increasing the photon number leads to an increase in the probability of the generation of one more photon in the same state. This constitutes one of the basic quantum advantages of laser-stimulated emission, showing that the emission of a coherent photon is more probable than the absorption.
Magnetic field fluctuations analysis for the ion trap implementation of the quantum Rabi model in the deep strong coupling regime
Published in Journal of Modern Optics, 2018
Ricardo Puebla, Jorge Casanova, Martin B. Plenio
One of the simplest, yet fundamental, quantum models consists of a two-level system interacting with a single-mode bosonic field. This system, besides of being a nice textbook example of fundamental quantum physics, describes realistic phenomena in a variety of physical situations, and it is commonly known as quantum Rabi model (QRM), in honour of the groundbreaking work of the author of the same name who analyzed the interaction of a spin with a classical field [1,2]. Certainly, this simple model emerges naturally in different physical situations; although primarily studied in the realm of quantum optics, its relevance encompasses even quantum information processing [3]. This underlies the considerable attention that this model has attracted and the efforts devoted during the last decades to elucidate the physics of the QRM [4]. Furthermore, although the first fully quantized version of this model dates from 1963 [5], the QRM still reveals new results, such as its integrability [6], the appearance of a finite-component quantum phase transition in an appropriate limit [7,8] or the structured dynamics of revivals in the deep strong coupling (DSC) regime [9] to name a few recent insights.