Scientists Slow the Speed of Light

lightbox32 sends news that scientists have found a way to slow individual photons within a beam of light. Their work was published today in Science Express (abstract, pre-print). The researchers liken a light beam to a team of cyclists — while the group as a whole moves at a constant speed, individual riders may occasionally drop back or move forward. They decided to focus on the individual photons, rather than measuring the beam as a whole. The researchers imposed a particular pattern on a photon, then raced it against another photon, and found that the two arrived at their destination at slightly different times. The work demonstrates that, after passing the light beam through a mask, photons move more slowly through space. Crucially, this is very different to the slowing effect of passing light through a medium such as glass or water, where the light is only slowed during the time it is passing through the material—it returns to the speed of light after it comes out the other side. The effect of passing the light through the mask is to limit the top speed at which the photons can travel.

Comments

Obvious work is obvious

[Anonymous Coward]

Speed up light and then I'll be impressed.

Physics 101?

[TFlan91]

Umm... This sounds like Physcis 101... Something traveling through a medium vs a vacuum will always be slower was one of the first lessons I learned

This feels like a bug..

[JMZero]

Surely this wasn't intended behavior? The more we poke at reality, the more it seems like a simulation that works really well, but where you can see some artifacts once you get in close.