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Contact: Ben Stein
National Institute of Standards and Technology (NIST)
Caption: A single photon travels through alternating layers of low (blue) and high (green) refractive index material more slowly (top) or quickly (bottom) depending upon the order of the layers. A strategically placed additional layer (bottom) can dramatically reduce photon transit time.
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Related news release: Stacking the deck: Single photons observed at seemingly faster-than-light speeds