Approximate traces on groups and the quantum complexity class ${\mathrm{MIP}}^{co,s}$

Abstract

An open question in quantum complexity theory is whether or not the class ${\mathrm{MIP}}^{co}$, consisting of languages that can be efficiently verified using interacting provers sharing quantum resources according to the quantum commuting model, coincides with the class $coRE$ of languages with recursively enumerable complement. We introduce the notion of a qc-modulus, which encodes approximations to quantum commuting correlations, and show that the existence of a computable qc-modulus gives a negative answer to a natural variant of the aforementioned question.

8 pages; first draft; comments welcome!