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Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/7246
Title: Optical precursor of a single photon
Authors: Zhang, Shanchao
Chen, Jiefei
Liu, Chang
Loy, Michael M.
Wong, George K. L.
Du, Shengwang
Keywords: Direct observation
Dptical precursors
Heralded single photons
Cold atoms
Transparency
Slow-light effect
Single-photon
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/
URI: http://hdl.handle.net/1783.1/7246
Appears in Collections:PHYS Journal/Magazine Articles

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