An experiment with atoms at nanokelvin temperatures has produced the remarkable observation of light pulses travelling at velocities of only 17 m s−1. The large optical nonlinearities seen in this system may open up new opportunities in quantum optics.
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Marangos, J. Slow light in cool atoms. Nature 397, 559–560 (1999). https://doi.org/10.1038/17475
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DOI: https://doi.org/10.1038/17475
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