Dynamical control of atoms with polarized bichromatic weak field

TL;DR

This paper demonstrates ultranarrow, polarization-controlled population oscillations in atoms driven by a bichromatic field, achieving subnatural linewidths without quantum interference, enabling precise dynamical control.

Contribution

It introduces a method for ultranarrow population oscillation control using polarization engineering, distinct from traditional quantum interference approaches.

Findings

Achieves subnatural linewidth in population oscillations.

Demonstrates polarization-based temporal shaping of atomic states.

Enables generation of multiple sidebands at low light levels.

Abstract

We propose ultranarrow dynamical control of population oscillation (PO) between ground states through the polarization content of an input bichromatic field. Appropriate engineering of classical interference between optical fields results in PO arising exclusively from optical pumping. Contrary to the expected broad spectral response associated with optical pumping, we obtain subnatural linewidth in complete absence of quantum interference. The ellipticity of the light polarizations can be used for temporal shaping of the PO leading to generation of multiple sidebands even at low light level.