We can trap particles for a real amount of time. We don't need to slow them down. But just because you asked, we can slow down the speed of light in a vacuum by first putting it through a different medium. http://en.wikipedia.org/wiki/Slow_light
That doesn't mean [...], but it does mean, generally, getting off of the computer.
You must be new here...
Things equal to nothing else are equal to each other.