Nondegenerate parametric down conversion in coherently prepared two-level atomic gas

TL;DR

This paper investigates parametric down conversion in a coherently prepared two-level atomic gas, revealing unique phase matching conditions and non-saturable amplification, which could impact quantum optics applications.

Contribution

It introduces a novel analysis of down conversion in superposition-state atomic gases, highlighting multiple phase matching conditions and non-saturable amplification effects.

Findings

Phase matching splits into three conditions due to superposition.

Amplification coefficients do not saturate with increased pump intensity.

System exhibits unique properties under sideband generation.

Abstract

We describe parametric down conversion process in a two-level atomic gas, where the atoms are in a superposition state of relevant energy levels. This superposition results in splitting of the phase matching condition into three different conditions. Another, more important, peculiarity of the system under discussion is the nonsaturability of amplification coefficients with increasing pump wave intensity, under "sideband" generation conditions.