Cut the noise: mentioning a simple test bench cannot mask the complexity of portfolio optimization.
A test on 250 S&P 500 assets is not representative of our diversified portfolios, which contain thousands of positions.
The liquidity and compliance constraints of Japan are much more intense than what such a test can simulate.
A system with 64 qubits is just a beginning, far from the scale of actual investment of a Japanese pension fund.
For example, managing Japanese government bonds involves volumes and market sensitivities that this prototype does not capture at all.