We must not conflate the physical world with its mathematical model in our physical theory.

On this year’s World Quantum Day, IQOQI Vienna once again opens its doors to the public.

We present a bundle geometric formulation of non-relativistic many-particles Quantum Mechanics (QM) where wave functions are seen as a cocyclic tensorial 0-form on configuration space-time seen as a principal bundle.

After reminding why relationality is the paradigmatic physical insight of General Relativistic theories, we discuss the bundle geometry of their field space.

Is gauge symmetry merely a redundancy in our description, or does it carry a deeper information-theoretic significance? Quantum error-correcting codes (QECCs) show that redundancy can serve as a resource for protecting information against noise.

Discussions of determinism and indeterminism of physical theories usually focus on properties of dynamical laws (e.g., uniqueness of solution). This is perfectly adequate in all the usual cases.

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.