The thing is, how do you experimentally distinguish subjective experience? I mean for all you know, you could be the only one with qualia and the rest of us are all philosophical zombies.
You can't, not today. Maybe one day 500 years in the future when we can connect each others brains as Ramachandran jokes. But I am not a solopsist. And it is evident that all living things have subjective experiences from a 3rd person view. Thus I must deduce that qualia exist and that qualia is fundamental to the universe. Most newer scientific theories of consciousness also state that although they cannot really define what quale (plural of qualia?) are, they are fundamental to the universe.
It is the nature of qualia which is the ontological gap facing all scientific fields with regards to consciousness. Until we figure out what it is, we won't be having any AI that can reflect on itself. No HAL, no Kurzweilian robogods. Heck no T-1000 either. Once we figure out whether it is a product of our brains or something fundamental to reality then we can try to reproduce it in a machine. After which we can devise several tests to give us a better idea as to whether a machine experiences qualia.
Koch and Tononi have made up one such test. There are others. Even then until we can connect our brain with the machine's inner most thoughts it will be impossible to confirm whether it has qualia. We'll just have to take their word for it until we can perform such a connection.