Optica

Optica is a high-impact, monthly, peer-reviewed open access scientific journal published by the Optica Publishing Group (formerly OSA). Launched in 2014, it covers fundamental and applied research across the entire spectrum of optics and photonics with a strong emphasis on novelty, significance, and broad scientific interest.
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Using a new cone-shaped solar concentrator, researchers showed that sunlight can be used to create entangled photons. This could one day enable satellites to create secure encryption keys using the sunlight already abundant in space.

Sunlight Can Generate Quantum Entanglement, No Laser Required

Physicists funneled concentrated sunlight into a nonlinear crystal and pulled out polarization-entangled photon pairs, the first entanglement ever measured from a sunlight-pumped source. The pairs violated Bell’s inequality, showing that lasers are optional for quantum light.