Gaussian pulse-induced imperfect rephasing in coherent transients

TL;DR

This paper investigates how Gaussian pulses cause imperfect rephasing in the double-rephasing photon-echo scheme, affecting quantum memory efficiency and providing insights into the underlying atomic rephasing processes.

Contribution

It offers a detailed analysis of the rephasing process at the atomic level, explaining partial echo emissions and optimizing efficiency in the DRPE scheme.

Findings

Maximum echo efficiency reaches 26%.

Gaussian pulses induce imperfect rephasing.

Insights into atomic rephasing mechanisms.

Abstract

A double-rephasing photon-echo (DRPE) scheme inherently satisfies no-population inversion condition for quantum memory applications, while the resultant absorptive coherence prohibits echo radiation out of the medium. To solve the absorptive echo problem in the DRPE scheme, a controlled double-rephasing echo protocol has been presented and discussed for the collective atom phase control. In the DRPE scheme, however, a typical Gaussian light can cause imperfect rephasing processes resulting in a partial emission of photon echoes. Here, the rephasing process of individual ensemble atoms is thoroughly investigated to discuss the unpermitted echo observations in the DRPE scheme, where its maximum efficiency is as high as 26% in amplitude.