Between two mirrors, the quantum dot filters the light beams with just one photon per package out of the laser, so that only packages with multiple photons remain. Credit: Leiden Institute of Physics
Leiden physicists have manipulated light with large artificial atoms, ie quantum dots. Before, this has only been accomplished with actual atoms. It is an important step toward light-based quantum technology. When you point a laser pointer at the screen during a presentation, an immense number of light particles races through the air at a billion km/hour. They don’t travel in a continuous flow, but in packages containing varying numbers of particles. Sometimes as many as 4 so-called photons pass by, and other times none at all...
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