Photons meet with three-way split : Nature News

Method that generates photon triplets could be a boon for quantum information.

…Generating three photons from one is now a reality, opening the door to demonstrating entanglement.Karl Dolenc/iStockphotoA single photon can now be split into three, thanks to the work of an international team of physicists. The achievement could open up new avenues in the field of quantum information.
The ability to split photons may not sound as extraordinary as other achievements in quantum physics, but for decades it has proved crucial to the success of many experiments. Often researchers need to know that photons are emitted at precisely the same time and are in phase with each other, and this is almost impossible if the photons come from separate sources.
In the past, devices have been able to split a photon only into two. In the typical method used to achieve this, known as parametric down-conversion, a laser beam is shone into a special ‘non-linear’ crystal…

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Photons meet with three-way split : Nature News

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