Phys. Rev. Lett. 106, 243602 (2011) [4 pages]Optical Precursor of a Single Photon
See accompanying Physics Synopsis 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. © 2011 American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.106.243602
DOI:
10.1103/PhysRevLett.106.243602
PACS:
42.50.Gy, 32.80.Qk, 42.50.Dv
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.