Now You See it, Now You don't: Time Cloak Created

I'm not a physicist or anything, but it seems to me that this would create more of a delay in time not a complete absence of time. If this were the case, that they were able to "hide" 50 picoseconds of time, how did they know they "hid" it? How is anyone able to calculate "hidden time"; on what scale did they measure this length of time? Did someone sit their with some high-speed stopwatch and calculate it? If so, what were they looking for; a break in the light from the lasers? If that is the case, how do they know the light that finally met their eye after the break in the light was the same light before the break in the light occurred? How do they know the absence of light for that 50 picoseconds was even "hidden"?

Brennan of KY 5:04PM January 10, 2012