Unsolved problem in physics: Is a universal quantum computer sufficient to efficiently simulate an arbitrary physical system? (more unsolved problems in physics)

I'm thinking that we might be able to understand "Unknown Matter" through Quantum Computing. Why?

Because Unknown or "Dark" meaning unknown matter is 96% of the known universe and this problem is much more likely to be solved through a Quantum Computer than a regular digital computer. Why?

Because the differences of  Unknown matter might be better understood at a quantum level because the unknown  matter that composes 96% of the known universe does not contain either time or space (at least in any conventional manner we know of).