# Could second quantisation and QFT become a problem when scaling up quantum computers?

So I was wondering about the following:

I can encode an algorithm in position $$\hat x$$ in quantum mechanics. However, in QFT position is not an operator it becomes a parameter $$x$$.

Has anyone expressed concern that quantum field theory (QFT) will become relevant in the scale-up when creating a quantum computer and thus one should be careful about the second quantization of operators?

• "I can encode an algorothm in position" which algorithm did you have in mind? – user1271772 Jan 2 at 13:24

• Distinction between cQED and QED. Questions like whether you are dealing with $a_k$/$a_k^\dagger$ for all wavevectors or not, is electron part of a spinor field? – AHusain Oct 28 '19 at 17:33