Exact gradients for MZI-based optical neural networks can be obtained with the parameter-shift rule, using shifted phase measurements.
Ryan Hamerly, Saumil Bandyopadhyay, and Dirk Englund
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Gradients of unitary optical neural networks using parameter-shift rule
Exact gradients for MZI-based optical neural networks can be obtained with the parameter-shift rule, using shifted phase measurements.