Researchers Show Sunlight Can Generate Quantum Entanglement

Researchers demonstrated for the first time that concentrated sunlight can generate quantum-entangled photon pairs with high fidelity, challenging the long-held assumption that lasers are required for this process. By concentrating sunlight collected over 1.4 square meters into a nonlinear crystal, the team produced polarization-entangled photons with nearly 94% fidelity and correlations that violated Bell’s inequality, confirming genuine quantum entanglement. The findings suggest sunlight-powered quantum light sources could support more energy-efficient and resilient quantum communication, sensing, and computing systems, particularly for satellites, deep-space missions, and other resource-constrained environments. PRESS RELEASE — Scientists have demonstrated that sunlight, as a natural light source, can generate quantum-entangled photon pairs. With their findings, the international…