Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.243602
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Funding
- Hong Kong Research Grants Council [600710]
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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.
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