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Looking ahead: Sunlight has been used to generate entangled photon pairs, offering an early look at how quantum technology could reduce its reliance on power-intensive lasers. Researchers at the University of Ottawa and the Max Planck Institute for the Science of Light in Erlangen, Germany, used focused sunlight to produce entangled photons, which are essential to many photonic quantum computing and quantum communications systems.
The research, which was published in Optica, does not suggest that sunlight can replace laser-based quantum sources. Those systems remain more precise and produce stronger results. But the study shows that the light used to create entangled photons does not necessarily have to come from a laser, challenging the long-standing assumption that it does.
Entangled photons are pairs of light particles with linked quantum properties. Measuring one particle can reveal information about the corresponding measurement of the other, even when the two are separated. That behavior makes entangled photons useful for quantum encryption and other forms of quantum information processing.
