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 language||English (US)|
|Number of pages||5|
|Journal||Physical review letters|
|State||Published - Apr 30 2001|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)