Rotating wave approximation and entropy

Abstract

This paper studies composite quantum systems, like atom-cavity systems and coupled optical resonators, in the absence of external driving by resorting to methods from quantum field theory. Going beyond the rotating wave approximation, it is shown that the usually neglected counter-rotating part of the Hamiltonian relates to the entropy operator and generates an irreversible time evolution. The vacuum state of the system is shown to evolve into a generalized coherent state exhibiting entanglement of the modes in which the counter-rotating terms are expressed. Possible consequences at observational level in quantum optics experiments are currently under study.

8 pages, 1 figure, introduction extended

References in corpus (4)

• Strong atom-field coupling for Bose-Einstein condensates in an optical cavity on a chip
• Quantum Zeno and Anti-Zeno Effect without Rotating Wave Approximation
• Atom detection and photon production in a scalable, open, optical microcavity
• Energy concentration in composite quantum systems

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