Control of spontaneous emission of an inverted Y-type atomic system coupled by three coherent fields

TL;DR

This paper analyzes how three coherent fields influence spontaneous emission in an inverted Y-type atomic system, revealing controllable spectral features like line narrowing, splitting, and dark resonance through quantum interference effects.

Contribution

It provides an analytical model for the spontaneous emission spectrum in an inverted Y-type system and demonstrates control over spectral features via field amplitudes and initial states.

Findings

Spectral line narrowing observed

Spectrum splitting and dark resonance identified

Spectral features controllable by field parameters

Abstract

We investigate the spontaneous emission from an inverted Y-type atomic system coupled by three coherent fields. We use the Schr\"{o}dinger equation to calculate the probability amplitudes of the wave function of the system and derive an analytical expression of the spontaneous emission spectrum to trace the origin of the spectral features. Quantum interference effects, such as the spectral line narrowing, spectrum splitting and dark resonance are observed. The number of spectral components, the spectral linewidth, and relative heights can be very different depending on the physical parameters. A variety of spontaneous emission spectral features can be controlled by the amplitudes of the coupling fields and the preparation of the initial quantum state of the atom. We propose an ultracold atomic $^{87}Rb$ system for experimental observation.