The Achilles' heel of this proposal lies in the extrapolation of a limited test bench to large-scale portfolio management.
A universe of 250 S&P 500 assets has nothing to do with the thousands of diversified positions we manage in Switzerland, where liquidity constraints and compliance are paramount.
A 64-qubit quantum system, although promising, does not have the capacity to handle this scale or the granularity needed for true optimization.
Relying on this proof of concept for critical investment decisions poses an unacceptable failure risk.
For example, managing a Swiss institutional portfolio involves considerations of currency risk and reputation that far exceed this simplified model.