A cool implementation of a deep ANN using a similar system: https://arxiv.org/pdf/1610.02365.pdf https://arxiv.org/pdf/1610.02365.pdf (the nonlinear units and

A cool implementation of a deep ANN using a similar system: https://arxiv.org/pdf/1610.02365.pdf https://arxiv.org/pdf/1610.02365.pdf (the nonlinear units and the backprop are done on a classical computer). The paper also points out that thermal cross-talk between the thermo-optical phase shifters can limit gate fidelities or conversely the smallest spacing between the waveguides.