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One photon is split into three entangled individual photons

16.03.2020

Physicists at the Institute for Quantum Computing (IQC) at the University of Waterloo have developed a new technology that splits one photon of light into three separate photons. This technology is based on the SPDC (spontaneous parametric down-conversion) method, which allows you to get what in quantum optics is called the non-Gaussian state of light, which is considered one of the main components necessary to achieve quantum superiority.

"The splitting of a photon into two technology has been the workhorse of research in quantum mechanics for over 30 years," says Chris Wilson, professor and lead researcher. quantum optics and opens up an entirely new area of research."

To circumvent the known limitations of the SPDC method, scientists used microwave photons (quanta of microwave radiation), which fell into the cavity of a special superconducting parametric resonator. The resulting three photons are almost identical in all basic parameters, and in the very near future, scientists plan to test for the existence of quantum entanglement between all three photons.

“The non-Gaussian state of light and the operations performed with its help are a key component for achieving quantum superiority,” says Professor Wilson, “All this is very difficult to model on classical computer systems, resulting in an insufficient amount of theoretical and practical work in this area. And we hope that our achievement will allow us to move this entire area off the ground."

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