This is analogous to experiments repeated by several researchers over the last few years.
They appeared to show light travelling than c.
The explanation offered is that the light pulses are shaped so that the front portion arrives earlier than main portion and this allows the full light pulse to be reconstructed before the main pulse arrives.
This can give the impression that the light is moving faster than light or even that the pulse arrives at its destination before the main pulse leaves the origin point.

Some refs:

Physics News Update Number 495 - Story SUPERLUMINAL LIGHT PROPAGATION.
http://www.aip.org/pnu/2000/split/pnu495-2.htm

Scientists Claim To Break Speed-of-Light Barrier
By Maia Weinstock
Staff Writer
posted: 06:06 pm ET
19 July 2000
http://www.space.com/scienceastronomy/generalscience/faster_than_c_000719.html

Wednesday, 19 July, 2000, 18:09 GMT 19:09 UK
Beam smashes light barrier.
"Dramatic demonstration
But the NEC scientists believe their work does not violate Einstein's theory.
"Writing in the journal Nature, Dr Lijun Wang and colleagues say their light beam raced through the atom trap so quickly that the leading edge of the pulse's peak actually exited before it had entered."
http://news.bbc.co.uk/1/hi/sci/tech/841690.stm

May 30, 2000
Light Exceeds Its Own Speed Limit, or Does It?
By JAMES GLANZ
"As most physicists interpret the experiment, it is a low-intensity
precursor (sometimes called a tail, even when it comes first) of the
incoming wave that clues the cesium chamber to the imminent arrival of
a pulse. In a process whose details are poorly understood, but whose
effect in Dr. Wang's experiment is striking, the cesium chamber
reconstructs the entire pulse solely from information contained in the
shape and size of the tail, and spits the pulse out early.
"If the side of the chamber facing the incoming wave is called the
near side, and the other the far side, the sequence of events is
something like the following. The incoming wave, its tail extending
ahead of it, approaches the chamber. Before the incoming wave's peak
gets to the near side of the chamber, a complete pulse is emitted from
the far side, along with a backward wave inside the chamber that moves
from the far to the near side."
http://www.nytimes.com/library/national/science/053000sci-physics-light.html

Bob Clark