Sunlight-powered setup generates quantum entanglement
Today's quantum technologies rely on energy-intensive lasers, raising concerns that scaling them up could further increase energy demands. In new work, researchers have demonstrated that quantum entanglement between photons can be generated directly from sunlight, offering a potential alternative.
Quantum entanglement, a key component in quantum technologies, has been generated directly from sunlight by a research team. This breakthrough could lead to more energy-efficient and accessible quantum applications. Researchers at the University of Ottawa and the Max Planck Institute for the Science of Light developed a solar concentrator that focused sunlight onto a tiny nonlinear crystal, creating polarization-entangled photon pairs through a process called spontaneous parametric down-conversion (SPDC).
The entanglement produced from sunlight was found to be about 94% similar to a perfectly entangled state and violated Bell's inequality, confirming its quantum nature. The incoherent nature of sunlight did not hinder the creation of polarization entanglement. The team's work, published in Optica, builds upon previous theoretical predictions and experimental observations of incoherent light producing quantum entanglement.
The researchers are now focusing on improving the brightness and quality of the entanglement for potential deployment in satellites, which could benefit secure communication and ultra-precise sensing applications.
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