From what I understand, a living neural network learns several orders of magnitude more efficiently than an artificial one.
I'm not sure where that difference comes from. But my brain probably isn't doing back propagation, it's probably doing something very different.
(eg different kinds of learning for long-term memory, short-term memory, languages, faces and reflexes.)
The intersection of what with physics?
Sir Roger Penrose, on quantum consciousness (and there is some regret on his part here) -- OR -- Jacob Barandes for a much more current thinking on this sort of intersectional exploratory thinking.