Signal velocity, causality, and quantum noise in superluminal light pulse propagation

A. Kuzmich, A. Dogariu, L. J. Wang, P. W. Milonni, R. Y. Chiao

Research output: Contribution to journalArticlepeer-review

192 Scopus citations


A realistic definition of the velocity of the signal carried by a light pulse is presented. This velocity is analyzed for the recently demonstrated superluminal light impulse propagation. It is shown that while the pulse and the effective signal are both advanced via propagation at a group velocity higher than c, or even negative, the signal velocity is still bounded by c.

Original languageAmerican English
Pages (from-to)3925-3929
Number of pages5
JournalPhysical review letters
Issue number18
StatePublished - Apr 30 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

Cite this