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Optical Precursor of a Single Photon

Authors Zhang, Shanchao
Chen, Jiefei
Liu, Chang
Loy, Michael Ming-tak
Wong, George Ke Lun
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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