Influence of pure-dephasing by phonons on exciton-photon interfaces: Quantum microscopic theory
Abstract
We have developed a full quantum microscopic theory to analyze the time evolution of transversal and longitudinal components of an exciton-single photon system coupled to bulk acoustic phonons. These components are subjected to two decay processes. One is radiative relaxation and the other is pure-dephasing due to exciton-phonon interaction. The former results in a decay with an exponent linear to time, while the latter causes a faster initial decay than the radiative decay. We analyzed the dependence of the components on the duration of the input one-photon pulse, temperature, and radiative relaxation rates. Such a quantitative analysis is important for the developments of atom-photon interfaces which enable coherent transfer of quantum information between photons and atomic systems. We found that, for a GaAs spherical quantum dot in which the exciton interacts with bulk phonons, the maximal probability of the excited state can be increased up to 75 %. This probability can be considered as the efficiency for quantum information transfer from photon to exciton.
Keywords
Cite
@article{arxiv.quant-ph/0702198,
title = {Influence of pure-dephasing by phonons on exciton-photon interfaces: Quantum microscopic theory},
author = {Kunihiro Kojima and Akihisa Tomita},
journal= {arXiv preprint arXiv:quant-ph/0702198},
year = {2009}
}
Comments
9pages, 5figures