Storing a light pulse in a vapour is by now a standard laboratory technique. For such optical memory to become truly practical, however, the fidelity of the technique has to be improved. Combining light storage with nonlinear wave mixing may offer a way forwards.
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Fleischhauer, M. A little nonlinear help. Nature Photon 3, 76–77 (2009). https://doi.org/10.1038/nphoton.2008.282
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DOI: https://doi.org/10.1038/nphoton.2008.282
