Semiclassical Dynamics from Zeno-Like measurements

TL;DR

This paper demonstrates that semiclassical dynamics in atom-field systems can be derived through frequent Zeno-like measurements on one subsystem, providing a measurement-based approach independent of field intensity, exemplified by the Jaynes-Cummings model.

Contribution

It introduces a novel measurement-based method to obtain semiclassical evolution in coupled quantum systems, extending beyond traditional intensity-based approximations.

Findings

Semiclassical dynamics can be achieved via Zeno-like measurements.

The approach is independent of the field intensity.

Application to the Jaynes-Cummings model confirms validity.

Abstract

The usual semiclassical approximation for atom-field dynamics consists in substituting the field operators by complex numbers related to the (supposedly large enough) intensity of the field. We show that a semiclassical evolution for coupled systems can always be obtained by frequent Zeno-like measurements on the state of one subsystems, independently of the field intensity in the example given. We study the Jaynes Cummings model from this perspective.