An alternative realization of spontaneous emission cancelation via Field Generated Coherence (FGC)

TL;DR

This paper introduces a novel atomic scheme using Field Generated Coherence (FGC) to achieve spontaneous emission cancellation, offering an alternative to traditional methods and enabling externally controllable trapping conditions.

Contribution

It presents a new FGC-based atomic scheme for spontaneous emission cancellation, demonstrating controllable trapping conditions and novel dark states in sodium atomic systems.

Findings

Complete cancellation of decay from the central dressed state under trapping conditions.

Achievement of externally controllable trapping conditions in a 4-field-driven 5-level atomic system.

Observation of a bright atom being darkened under trapping conditions in sodium D1 line.

Abstract

In contrast to the traditional Spontaneous Generated Coherence (SGC), Field Generated Coherence (FGC)-based atomic scheme is presented for spontaneous emission cancellation. It is easy to achieve externally controllable experimental trapping condition in this 4-field-driven 5-level atomic system. Consequently, due to the FGC the decay from the central dressed \emph{bare-energy-state} of the set of upper three closely spaced hyperfine decaying states of Sodium D2 line is completely cancelled under the trapping condition, exhibiting a novel phenomenon of a \textit{dark bare-energy-state}% . Extending to an atomic system of simple probability loss, based on Sodium D1 line, the bright atom can also be darkened under its trapping condition, representing another experimentally viable, novel and interesting phenomenon.