Peter Bierhorst’s machine is no pinnacle of design. Nestled in the Rocky Mountains inside a facility for the National Institute of Standards and Technology, the photon-generating behemoth spans an entire building. Its lasers, mirrors, and lenses are split among three laboratories, two of them at opposite ends of the L-shaped building. The whole thing is strung together with almost 900 feet of optical fiber. “It’s a prototype system,” the mathematician explains.

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