Scientists harness sunlight to create quantum entanglement, bypassing need for lasers

For generations, the quantum world was thought to demand perfect order — coherent laser light, precisely synchronized, to coax particles into their strange entangled dance. A team of researchers from Canada and Germany has quietly dismantled that assumption, demonstrating that ordinary sunlight, chaotic and sprawling as it is, can generate genuine quantum entanglement with 94% fidelity to an ideal quantum state. The discovery invites us to reconsider how much complexity we have been building into our tools when the oldest light source in the solar system may have been sufficient all along.