Optical precursor of a single photon
Loy, Michael M.T.
Wong, George K.L.
|Source||Physical Review Letters , v. 106, (24), June 2011|
|Summary||We report the direct observation of optical precursors of heralded single photons with step-and square-modulated wave packets passing through cold atoms. Using electromagnetically induced transparency and the slow-light effect, we separate the single-photon precursor, which always travels at the speed of light in vacuum, from its delayed main wave packet. In the two-level superluminal medium, our result suggests that the causality holds for a single photon.|
|Rights||© 2011 American Physical Society|
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