The Computing Spacetime

摘要

The idea that the Universe is a program in a giant quantum computer is both fascinating and suffers from various problems. Nonetheless, it can provide a unified picture of physics and this is very useful for the problem of Quantum Gravity where such a unification is necessary. We give an introduction to the idea of the universe as a quantum computation, the problem of Quantum Gravity, and Quantum Graphity, a simple way to model a dynamical spacetime as a quantum computation.