The world is fundamentally quantum mechanical. That means that our minimal ontological commitment relies only on having a Hilbert space, a quantum state, and an evolution equation (Schroedinger's equation) together with a Hamiltonian.

Relativistic protocols have been proposed to overcome impossibility results in classical and quantum cryptography. In such a setting, one takes the location of honest players into account, and uses the impossibility of superluminal signalling to…

The Kochen-Specker (KS) theorem is often taken as a notion of nonclassicality that is independent of entanglement since it's provable on a three-dimensional Hilbert space. However, the smallest system on which both the KS theorem and entanglement are…

Coupling between light and matter has long been limited to the weak coupling regime, because of the small value of the fine structure constant.

Part II: the pandemic years

We show that the local and deterministic mode of description is not only in conflict with the quantum theory, but also with relativity.

The formalism of quantum theory over discrete systems is extended in two significant ways. First, tensors and traceouts are generalized, so that systems can be partitioned according to almost arbitrary logical predicates. Second, quantum evolutions…

The metric field of general relativity is almost fully determined by its causal structure.

Time at the Planck scale (10^-44s) is an unexplored physical regime.

Parasite publishers: a threat to the pursuit of knowledge