Bonn physicists create “super-photon”

Physicists from the University of Bonn have developed a completely new source of light, a so-called Bose-Einstein condensate consisting of photons. Until recently, expert had thought this impossible.

This method may potentially be suitable for designing novel light sources resembling lasers that work in the x-ray range.

Among other applications, they might allow building more powerful computer chips. The scientists are reporting on their discovery in the upcoming issue of the journal
Nature.

By cooling Rubidium atoms deeply and concentrating a sufficient number of them in a compact space, they suddenly become indistinguishable. They behave like a single huge ''super particle.'' Physicists call this a Bose-Einstein condensate.

For ''light particles,'' or photons, this should also work. Unfortunately, this idea faces a fundamental problem. When photons are ''cooled down,'' they disappear. Until a few months ago, it seemed impossible to cool light while concentrating it at the same time.

The Bonn physicists Jan Klärs, Julian Schmitt, Dr. Frank Vewinger, and Professor Dr. Martin Weitz have, however, succeeded in doing this – a minor sensation.