Decelerating photons get practical enough for information technology.
References
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Turukhin, A. V. et al. Observation of ultraslow and stored light pulses in a solid. Physical Review Letters, 88, 023602, (2002).
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Ball, P. Ruby slows light at room temperature. Nature (2003). https://doi.org/10.1038/news030324-4
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DOI: https://doi.org/10.1038/news030324-4
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