Abstract
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 . 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 . The achieved result does not depend on the coupling intensity, the atomic optical density, or the width and shape of the switching pulse.
© 2006 Optical Society of America
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