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|Title: ||Optical precursor of a single photon|
|Authors: ||Zhang, Shanchao|
Loy, Michael M.
Wong, George K. L.
|Keywords: ||Direct observation|
Heralded single photons
Delayed main wave packet
|Issue Date: ||16-Jun-2011 |
|Citation: ||Physical review letters, v. 106, 243602 (2011)|
|Abstract: ||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/|
|Appears in Collections:||PHYS Journal/Magazine Articles|
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