Well. One way would be to get bricks, 10nm^3 with sheer edges, and a single dopant at the centre. Constructing your QC would then simply be a matter of positioning bricks, perhaps by immersing them in liquid and pouring them over something.
The best strategy for regular arrays involves natural alignment through chemistry of some sort, for example if donors could be made to repel each other over some range, that would be very useful.
An alternative is some sort of nano-periodic structure that can be filled in in some kind of regular fashion and then etched away.
Perhaps a long biological molecule could be periodic on the scale required, and laid flat and straight on a substrate? The unwanted bits could then be removed, and crystal grown around the remainder..
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