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Optical precursor of a single photon

Authors Zhang, Shanchao
Chen, J.F.
Liu, Chang
Loy, M.M.T.
Wong, G.K.L.
Du, Shengwang
Issue Date 2011
Source Physical Review Letters , v. 106, (24), June 2011, article number 243602
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.
ISSN 0031-9007
Rights © 2011 American Physical Society
Language English
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