Sunlight creates quantum entanglement once thought to require lasers
Researchers have demonstrated that natural sunlight can generate pairs of entangled photons, a phenomenon previously thought to require coherent laser light. The experiment used a nonlinear crystal pumped by focused sunlight to produce polarization-entangled photon pairs. This finding challenges assumptions about the need for coherent sources in entanglement generation.
OutlookPlausible
Sunlight-driven quantum key distribution (QKD) terminals could be deployed on rooftops, using filtered natural light to create entanglement for secure communication.