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Quantum Electronics and Laser Science Conference

All-optical switching at ultra-low light levels

Jiepeng Zhang, Gessler Hernandez, Yifu Zhu

Published May 1, 2007• 0 citations
Publisher

Abstract

We report an experimental demonstration of all-optical switching with the signal and control light pulses containing about 20 photons each, corresponding to a control energy density of ~10-5photons per atomic cross section λ2/(2π).
DOI
10.1109/qels.2007.4431302

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We propose an all-optical switch that utilizes the technique of storage and retrieval of light pulses. A single photon (probe pulse) switched by another (switching pulse) is feasible, and the on-off ratio can be as large as 10 dB. We have experimentally demonstrated that the energy of the retrieved probe pulse is reduced to about 10% because of the presence of a switching pulse with an energy per unit area of one photon per lambda(2)/(2pi). The achieved result does not depend on the coupling intensity, the atomic optical density, or the width and shape of the switching pulse.