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Optical Precursor of a Single Photon

Authors Shanchao Zhang
J. F. Chen
Chang Liu
M. M. T. Loy
G. K. L. Wong
Shengwang Du
Issue Date 2011
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.
ISSN 0031-9007
Rights © 2011 American Physical Society
Language English
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