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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), 2011, Jun, 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 Physical Review Letters © copyright (2010) American Physical Society. The Journal's web site is located at
Language English
Format Article
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