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How Close Is Ordinary Light to Doing Quantum Computing?

Neil Savage, *IEEE Spectrum*, 27 Apr 2021
via ACM TechNews, Wednesday, April 28, 2021

Using mirrors to generate a light beam with multiple, classical
entanglements is possible, according to researchers at China's Tsinghua
University, the U.K.'s University of Southampton, and South Africa's
University of Witswaterand (WITS). WITS' Andrew Forbes said this technique
can entangle a potentially infinite number of photonic pathways, and his
team demonstrated eight degrees of freedom within a single beam by changing
the spacing between mirrors in the laser cavity. Said Forbes, "Not only
could we make light that took many different paths at once, but we could
encode information into those paths to make it look like we were holding a
high-dimensional multi-photon quantum state." Forbes added that since
quantum computing relies on particles existing in multiple states, some
algorithms could be run using classically entangled light, bridging quantum
and classical computers.