Special detector measures the exact number of photons in a weak light pulse
One, two, three - many
For most people, light is just light. Not so for the physicists in the working group of Stephan Reitzenstein, from the Institute of Solid State Physics at TU Berlin. "We are very interested in exactly which processes cause light (i.e., photons) to be emitted. The so-called photon statistics, which t…








