"The ability to reduce everything to simple fundamental laws does not imply the ability to start from those laws and reconstruct the universe"
P.W. Anderson
Science, 4.August 1972, Vol 177, Number 4047
XOR or ⊕ - a type of logical disjunction on two operands that results in a value of true if the operands, or disjuncts, have opposite truth values. A simple way to state this is "one or the other but not both."
"The ability to reduce everything to simple fundamental laws does not imply the ability to start from those laws and reconstruct the universe"
Actually all problems in probability are about quantum mechanics. So even the outcome of a coin toss is the result of QM since the Uncertainty Principle can be scaled to everyday objects. In the case of a coin toss, the quantum uncertainty in the position of neurotransmitter molecules in the nervous system of a coin flipper might translate into an uncertainty in the number of times a coin turns in the air before being caught, ultimately determining whether it is a head or a tail. They showed that the calculations come up with the same numbers as conventional probability theory does.We argue using simple models that all successful practical uses of probabilities originate in quantum fluctuations in the microscopic physical world around us, often propagated to macroscopic scales.