[coffeeiscold]

If we are going to doubt something that looks and acts like it has qualia, then the same is true for any other human.

[DennisP]

Sure, I only really know that I have qualia. It seems reasonable to assume that something which looks like me has qualia like me. But if it's a simulation, it doesn't actually look like me at all.

It does have a sort of abstract mapping to something that looks like me, but since I have no idea what produces qualia, I have no way to know whether something essential is lost in that mapping.