Researchers Generate Quantum Entanglement Using Sunlight

Researchers have demonstrated that quantum entanglement between photons can be generated directly from sunlight, achieving quality comparable to traditional laser-based methods. The breakthrough combines theoretical insights showing incoherent light can create polarization entanglement with a new all-glass solar concentrator that focuses sunlight onto a nonlinear crystal. This approach could enable more energy-efficient quantum technologies, such as satellite-based secure encryption using abundant sunlight instead of power-hungry onboard lasers. Today’s quantum technologies rely on energy-intensive lasers, raising concerns that scaling them up could further increase energy demands. In new…