Physicists harness sunlight for quantum entanglement
A proof-of-principle experiment used concentrated sunlight to produce entangled photons
Scientists have demonstrated a groundbreaking method for generating entangled photons using sunlight, potentially revolutionizing the energy efficiency of quantum computing. In a study published in Optica, researchers from the University of Ottawa and the Max Planck Institute for the Science of Light created entangled photons by focusing concentrated sunlight onto a tiny crystal.
This technique, known as spontaneous parametric down-conversion, relies on a property of light that doesn't depend on color or direction, making it possible to produce entangled photons using free sunlight. The all-glass, cone-shaped solar concentrator built by the researchers' team at the Max Planck Institute funneled diffuse sunlight into a thin optical fiber, producing photon pairs with a fidelity of around 94 percent and violating Bell's inequality—an indicator of quantum behavior.
While the entanglement quality was slightly lower than that generated by laser-driven sources, the team believes this gap can be narrowed with further engineering. If successfully implemented, this sunlight-powered quantum entanglement method could enable satellites to generate quantum encryption keys using sunlight, reduce the energy demands of data centers, and pave the way for more accessible and environmentally friendly quantum computing technology.
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