Infrared Divergence in Quantum Electrodynamics

Calculation of Kolmogorov Entropy in Cavity Quantum Electrodynamics

In this paper Kolomogorov entropy of a simulated cavity quantum electrodynamics in a multi-partite system consisting of eight quantum dots in interaction with one cavity mode has been estimated. It has been shown that the Kolmogorov Entropy monotonically increases with the increasing coupling strength, which is a sufficient condition for chaotic behavior under ultrastrong coupling regime. The a...

Quantum Electrodynamics in Graphene

Quantum quincunx in cavity quantum electrodynamics

We introduce the quantum quincunx, which physically demonstrates the quantum walk and is analogous to Galton’s quincunx for demonstrating the random walk. In contradistinction to the theoretical studies of quantum walks over orthogonal lattice states, we introduce quantum walks over nonorthogonal lattice states (specifically, coherent states on a circle) to demonstrate that the key features of ...

Resonant quantum gates in circuit quantum electrodynamics

G. Haack,1 F. Helmer,2 M. Mariantoni,3 F. Marquardt,4 and E. Solano5,6 1Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland 2Department of Physics, ASC and CeNS, Ludwig-Maximilians-Universität, Theresienstrasse 37, 80333 München, Germany 3Department of Physics, University of California, Santa Barbara, California 93106, USA 4Institut für Theoretische Physik, Un...

Quantum-classical crossover in electrodynamics

A classical field theory is proposed for the electric current and the electromagnetic field interpolating between microscopic and macroscopic domains. It represents a generalization of the density functional for the dynamics of the current and the electromagnetic field in the quantum side of the crossover and reproduces standard classical electrodynamics on the other side. The effective action ...