  We discuss the origin of causal set structure and the emergence of classical
space and time in the universe. Given that the universe is a closed
self-referential quantum automaton with a quantum register consisting of a vast
number of elementary quantum subregisters, we find two distinct but intimately
related causal sets. One of these is associated with the factorization and
entanglement properties of states of the universe and encodes phenomena such as
quantum correlations and violations of Bell-type inqualities. The concepts of
separations and entanglements of states are used to show how state reduction
dynamics generates the familial relationships which gives this causal set
structure. The other causal set structure is generated by the factorization
properties of the observables (the Hermitian operators) over the quantum
register. The concept of skeleton sets of operators is used to show how the
factorization properties of these operators could generate the classical causal
set structures associated with Einstein locality.
