With quantum computer, imagine a machine can make trillions and trillions of trillions.... of random mistakes in just a milisecond and who know may be with more complex and better rules.
Conscience is allot of random mistakes make our brain grow, conciencie is a collateral damage of our firts and second rule, but this is amazing don't you think? 
May be it looks imperfect like a 2 week embryo in a mother's womb.