Efficient cloning and dragging of microwave pulse into optical frequency pulse in a Doppler-broadened atomic medium

TL;DR

This paper demonstrates how a microwave pulse can clone and drag a weak optical probe pulse in a Doppler-broadened atomic medium, leveraging ground state coherence for potential quantum information applications.

Contribution

It introduces a method to clone and manipulate optical pulses using microwave-induced ground state coherence in a Doppler-broadened atomic system.

Findings

Probe pulse shape is cloned by microwave pulse shape.

Temporal position of probe pulse is dragged to that of microwave pulse.

Ground state coherence is key to the observed effects.

Abstract

The propagation of a weak optical pulse through an atomic system in closed $\Lambda$ configuration is investigated in which the hyper fine levels are coupled by a microwave pulse. Under three photon resonance condition, it is observed that the probe pulse shape gets cloned by the shape of the microwave pulse along propagation through the medium. The temporal position of the probe pulse is dragged to that of the microwave pulse. A simple expression for the linear susceptibility of the medium for the corresponding transition is derived in the Fourier domain. From the numerical analysis of dynamics using this expression, it is concluded that the novel effect arises from the ground state coherence of the hyper fine transitions induced by the microwave pulse.