It's not hard to imagine using the hydrogen position as a state, rather than presence. if it's in the left cell, on, if it's in the right cell off. if you've go

It's not hard to imagine using the hydrogen position as a state, rather than presence. if it's in the left cell, on, if it's in the right cell off. if you've got that then it's not hard to imagine, rather than one single probe pointing down, v, but instead a whole array vvvvvvvv. if the array of probes can be fabricated on a wafer, you can have massive parallelism. the memory would have cycles, a read 0 phase, any bit that needed to be flipped to one would be picked up, the array shifts to the left, any probe holding an hydrogen would then write. then a read 1 phase, which prepares for the zero writes. Obviously this depends critically on arrays of probes, which might not be possible. If it is, there's no reason to think this can't be massively parallel.