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photon flux

30.08.2010

A powerful source of photons for quantum teleportation has been created. Quantum teleportation is when in Paris they act on one photon, and in Tokyo at the same moment the properties of the second photon associated with the first change.

Based on this phenomenon, scientists hope to build tamper-resistant communication systems, quantum computers, and many other marvels. Pairs of bound photons are obtained by exciting quantum dots with a laser. However, now only one pair is born per hundred exciting impulses, which does not suit scientists in any way.

Specialists from the Laboratory of Photonics and Nanostructures of the Center for Photonics and Nanostructures located in the suburbs of Paris, led by Pascal Senellar, found a way to correct this shortcoming. To do this, they used a design, first created in 1997 in Germany, called the "photonic molecule".

This design is a microscopic column grown above or below a quantum dot, the cross section of which has the shape of a dumbbell. Two photons caught in its bulges interact with each other like atoms in a molecule. In particular, they can only have certain values of energy.

It is this design under the quantum dot that helped French scientists collect 20 times more bound photons than they have been able to do so far. This gives rise to hope for the creation of industrial devices using the phenomenon of quantum teleportation, especially since French physicists promise to soon bring the power of their source to one hundred percent.

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