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arXiv:quant-ph/0210123 · Physical Review A

Storing and releasing light in a gas of moving atoms

Gediminas Juzeliūnas, M. Mašalas, Michael Fleischhauer

Published Feb 14, 2003• 21 citations
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Abstract

We propose a scheme of storing and releasing pulses or cw beams of light in a moving atomic medium illuminated by two stationary and spatially separated control lasers. The method is based on electromagnetically induced transparency but in contrast to previous schemes, storage and retrieval of the probe pulse can be achieved at different locations and without switching off the control laser.

DOI
10.1103/physreva.67.023809

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We propose a scheme of storing and releasing pulses or cw beams of light in a moving atomic medium illuminated by two stationary and spatially separated control lasers. The method is based on electromagnetically induced transparency but in contrast to previous schemes, storage and retrieval of the probe pulse can be achieved at different locations and without switching off the control laser.
We consider storage and retrieval of light based on electromagnetically induced transparency in an atomic medium using nonadiabatic switching of a control field. We derive various conditions for writing (and reading) the light information to (and from) the atomic coherence. We obtain an analytical solution for the retrieval of the stored pulse that is in excellent agreement with the full numerical results. We identify the origin of distortion at the output and derive a condition to correct the distortions by manipulating the retrieval process.
We report an experiment in which optical pulses stored in an atomic system can be controllably released into two different photonic channels. By controllably turning on the retrieve control pulses at either 795 or 780nm780\phantom{\rule{0.3em}{0ex}}\mathrm{nm}780nm to read the stored optical pulses in a four-level double $\ensuremath{\Lambda}$-type atomic medium, we can obtain the released probe pulse at 795 or 780nm780\phantom{\rule{0.3em}{0ex}}\mathrm{nm}780nm, respectively. These readout pulses can be further separated spatially and directed into different optical propagation channels through a grating. Such controlled release of stored optical pulses may extend the capabilities of the quantum information storage technique, and can have applications in multichannel all-optical switching, all-optical routing, quantum information processing, and image storage systems.