Slow light?

Can light be slowed down enough for it to be useful in computing? Is it a need? Why the answer is yes and yes!

This is what Wikipedia said:

Researchers at UC Berkeley slowed the speed of light traveling through a semiconductor to 6 miles per second in 2004. This was in an effort to develop computers that will use only a fraction of the energy of today's machines.[1]

In 2005, IBM created a microchip that can slow down light, claiming that its light-slowing device is the first to be fashioned out of fairly standard materials, potentially paving the way toward commercial adoption.[2]

Well...I'd say that's something. Here's another one.

Hmm...but I got a question. why does the light speed up after it's being slowed down? How does the light sped up after it's been slowed down? What makes it speed up again? Did it really slow down? Or was it just our inaccurate instruments that erroneously told us that it is slowed? Did the light really slowed or did it just got blocked, bounced off into our eyes to be perceived, and another photon of light takes its place on the line? How do they know it's even the same photon of light? How do they measure they really only released only one photon?

Well...sorry for being a pain the the arse questioning machine...but I think they are valid, no?