Optical Precursor of a Single Photon
Chen, J. F.
Loy, M. M. T.
Wong, G. K. L.
|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.|
|Rights||Physical Review Letters © copyright (2010) American Physical Society. The Journal's web site is located at http://prl.aps.org/|
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