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. Author manuscript; available in PMC: 2021 Nov 29.
Published in final edited form as: Nature. 2021 Mar 10;591(7849):229–233. doi: 10.1038/s41586-021-03242-7

Fig. 3.

Fig. 3

Circuit implementation. One photon is coupled into the |0A0R〉 waveguide and undergoes different unitaries depending on whether a classical (a) or a quantum (b) epoch is implemented. The waveguides highlighted in yellow show the photon’s possible paths. Identity gates are represented by straight waveguides. Only the part of the processor needed for the computation is represented.