FAST LIGHT
A pulse propagates with a group velocity which is not bound by the speed of
light c, hence it can be higher than c, or even negative.
GAS : "Gainassisted superluminal light propagation," Nature 406,
2779 (2000).
see
Group
Velocity in Dispersive Media (1Mb movies!)
Fast light publications (click
here
for a complete publications list):

L. J. Wang, A. Kuzmich, and A. Dogariu, “Gainassisted superluminal light
propagation,” Nature 406,
2779 (2000)

A. Dogariu, A. Kuzmich, and L. J. Wang, "Transparent Anomalous Dispersion
and Superluminal Light Pulse Propagation at a Negative Group Velocity,"
Phys.
Rev. A (Atomic, Molecular and Optical Physics), 63 (5),
05380612, (2001).

A. Dogariu, A. Kuzmich, H. Cao, and L. J. Wang, "Superluminal light pulse
propagation via rephasing in a transparent anomalously dispersive medium,"
Optics
Express 8, 344350 (2001).

A. Kuzmich, A. Dogariu, L. J. Wang, P. W. Milonni, and R. Y. Chiao, "Signal
velocity, causality, and quantum noise in superluminal light pulse propagation,"
Phys.
Rev. Lett. 86, 3925 (2001).

H. Cao, A. Dogariu, and L. J. Wang, “Negative group
delay and pulse compression in superluminal pulse propagation,”
IEEE J.
Select. Topics Quantum Electron.,
Vol. 9, No. 1, 52 (2003).
Arthur Dogariu
 Princeton University 
adogariu@princeton.edu