There are plenty of behaviors of complex systems that we still struggle to model accurately. While we may be able to build conscious, sapient entities, I think that accurate modeling of human cognition, especially and individual human's cognition, may well be much, much further off, if at all possible.

While quantum effects may or may not be directly involved in human cognition, the fundemental difficulties getting an accurate measure of brain state may prevent us from doing any more that making a rough copy.