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Recently, Motes, Gilchrist, Dowling & Rohde [Phys. Rev. Lett. 113, 120501(2014)] presented a scheme for photonic boson-sampling using a fiber-looparchitecture. Here we show that the same architecture can be modified toimplement full, universal linear optics quantum computing, in variousincarnations. The scheme employs two embedded fiber-loops, a single push-buttonphoton source, three dynamically controlled beamsplitters, and a singletime-resolved photo-detector. The architecture has only a single point ofinterference, and thus may be significantly easier to align than other schemes.The experimental complexity of the scheme is constant, irrespective of the sizeof the computation, limited only by fiber lengths and their respective lossrates.

A simple scheme for universal linear optics quantum computing with constant experimental complexity using fiber-loops