Seth Lloyd, a professor of mechanical engineering and physics at MIT, [published a paper](https://arxiv.org/abs/1312.4455) and [a book](https://en.wikipedia.org/wiki/Programming_the_Universe) in which he shows that the universe can be 
regarded as a giant quantum computer. According to him, all observed phenomena are consistent with the model in which the universe is indistinguishable from a quantum computer, e.g., a quantum cellular automaton.

He considers the following two statements to be true:

1. The universe allows quantum computation.
2. A quantum computer efficiently simulates the dynamics of the universe.

To conclude with:

> 
> Finally, we can quantize question three: (Q3) ‘Is the universe a quantum
>  cellular automaton?’ While we cannot unequivocally answer this question
>  in the affirmative, we note that the proofs that show that a quantum computer
>  can simulate any local quantum system efficiently immediately imply
>  that any homogeneous, local quantum dynamics, such as that given by the
>  standard model and (presumably) by quantum gravity, can be directly reproduced
>  by a quantum cellular automaton. Indeed, lattice gauge theories,
>  in Hamiltonian form, map directly onto quantum cellular automata. Accordingly,
>  all current physical observations are consistent with the theory that
>  the universe is indeed a quantum cellular automaton.
> 
> 
> 

Does this theory hold up?