The laws of quantum mechanics provide a complete probabilistic account of the motion of particles regardless of whether or not free will exists. Physicist Steven Hawking supports this idea in his book, The Grand Design. He says that humans are therefore complicated biological machines. Hawking adds that although our behavior is impossible to predict perfectly in practice, "free will is just an illusion."
I don't care what Hawking BELIEVES, just what he scientifically discovers. Do we live in a deterministic and causal world or not? We don't know because of Heisenberg uncertainty principle.
Yes we have a complete probabilistic account of the motion of particles regardless of whether or not free will exists, that's the whole point: what we have is a probabilistic approach to reality; we don't know the inner works of particles, we just know probability. So still we don't know if our world is deterministic and causal and therefore we don't know whether fate or free will (under the actual definition) exists.