As the title says, it may be a nice idea to make the sizes of the Portals and Quantization (mostly the latter) fields dependent on the "complexity" of the Quantum Computer used.
This could be done by for instance crafting 2 QCs together to create a tier 2 QC, 2 tier 2 QCs to create a tier 3 QC, etc.
Of course you can only entangle QCs of the same tier.
For instance Tier 1 could only create a Quantization field of 7x7x7, Tier 2 15x15x15 and Tier 3 31x31x31.