Self-induced Transparency in a Semiconductor Quantum Dot medium at ultra-cold temperatures

TL;DR

This paper explores how ultra-cold semiconductor quantum dot media can support stable, minimally broadened pulses with low absorption, considering phonon interactions, for potential quantum communication applications.

Contribution

It demonstrates the feasibility of pulse propagation with minimal absorption and broadening in quantum dot media at ultra-cold temperatures, incorporating phonon effects via polaron transformation.

Findings

Stable pulse propagation with minimal absorption achieved

Pulse shape stability depends on environment temperature

Pulse breakup occurs at higher input pulse areas

Abstract

We investigate the feasibility of minimum absorption and minimum broadening of pulse propagation in an inhomogeneously broadened semiconductor quantum dot medium. The phonon interaction is inevitable in studying any semiconductor quantum dot system. We have used the polaron transformation technique to deal with quantum dot phonon interaction in solving system dynamics. We demonstrate that a short pulse can propagate inside the medium with minimal absorption and broadening in pulse shape. The stable pulse area becomes slightly higher than the prediction of the pulse area theorem and is also dependent on the environment temperature. The change in the final pulse shape is explained very well by numerically solving the propagation equation supported by the susceptibility of the medium. Our system also exhibits the pulse breakup phenomena for higher input pulse areas. Therefore, the considered scheme can have important applications in quantum communication, quantum information, and mode-locking with the advantage of scalability and controllability.