
The Photon Breakthrough: How Caltech Taught Silicon to Behave Like Fiber Optic Cable — and What It Means for Everything from AI to Quantum Computing
In a cramped basement laboratory at the California Institute of Technology, a slab of silicon sits on an optical table, no larger than a fingernail. A beam of red light, no thicker than a human hair, enters one end of a microscopic channel carved onto its surface. It snakes through a maze of bends and splitters, bounces off a series of precisely angled mirrors, and exits the other side — not as a dimmed, scattered whisper of its former self, but nearly as bright and coherent as when it began. The loss, measured in decibels per meter, is so low that it flirts with the physical limits set by the material itself.







