I will describe some key challenges of constructing a theory of quantum gravity beyond perturbation theory, and how they are addressed and resolved by using a lattice formulation in terms of Causal Dynamical Triangulations (CDT).

Quantum field theory (QFT) offers a variety of relativistic causality conditions evaluating the question: Are superluminal processes compatible with relativity?

In the famous protocol, the continuous parameters specifying a qubit are transported --or teleported-- using shared entanglement and only two bits of classical communication. This raises the problem of which system, if any, actually carries the…

Since the 1990s, we know that the way we model measurements in standard quantum mechanics cannot be extended to quantum field theory, because projective measurements conflict with relativity.