Photon statistics of radiation in an incoherently pumped three-level cascade system

TL;DR

This paper investigates how incoherent pumping affects the photon statistics of radiation in a three-level cascade EIT system, revealing significant changes in two-photon correlations and the potential for oscillating between classical and non-classical states.

Contribution

It demonstrates that weak incoherent pumping can significantly modify photon correlations without affecting EIT properties in a three-level cascade system.

Findings

Incoherent pump alters photon correlation characteristics.

Two-photon correlation oscillates between classical and non-classical regimes.

EIT features remain unchanged despite pump-induced modifications.

Abstract

We study the intensity-intensity correlations of the radiation emitted on probe transition in a three level cascade electromagnetically induced transparency (EIT) scheme. By applying an incoherent pump, we also monitor further changes in the characteristics of the emitted radiation. It is found that application of even a very weak incoherent pump can significantly alter the characteristics of the emitted radiation, even though the EIT characteristics remain unaltered. Our study demonstrates that for certain range of parameter values, the two photon correlation function in the probe transition oscillates between classical and non-classical domains.