Computing using Light

Some of the earliest ideas of quantum information involved quantum communication using light. But now we know that light can also be used to process quantum information, and moreover that this can be done using only familiar tools of the optics trade, similar to those already in use for standard optical communications - mirrors, phase shifters, and beam splitters. This project aims to make the dream of such "linear optical quantum computing" into a reality.

For further information please contact John Rarity (Bristol) at

Quantum gate made from single-photon sources, waveplates (W) and polarising beamsplitters (PBS).


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