Quantum Breakthrough: First-Ever Entanglement of Microwave and Optical Photons

https://scitechdaily.com/quantum-breakthrough-first-ever-entanglement-of-microwave-and-optical-photons

"entangled low-energy microwaves with high-energy optical photons... scaling up and interconnecting room temperature quantum computers... quantum-enhanced remote sensing... optical resonator nonlinear crystal changes optics in presence electric field... superconducting cavity houses crystal and enhances interaction... send billions photons into electro-optic crystal fraction microsecond, 1 optical photon splits into pair entangled photons: optical with slightly less energy than original and microwave photon lower energy"

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