Quantum Mechanics (QM) is one of the pillars of modern physics: an impressive amount of
experiments have confirmed this theory and many technological applications are based on …

We develop a novel approach to Bell inequalities based on a constraint that the correlations
exhibited by local variable theories must satisfy. This is used to construct a family of Bell …

A bstract A rather general method for determining the spin density matrix of a multi-particle
system from angular decay data is presented. The method is based on a Bloch …

A bstract Pair production of heavy vector bosons is a key process at colliders: it allows to test
our understanding of the Standard Model and to explore the existence of new physics …

The study of entanglement in particle physics has been gathering pace in the past few years.
It is a new field that is providing important results about the possibility of detecting …

We present three different matrix bases that can be used to decompose density matrices of d-
dimensional quantum systems, so-called qudits: the generalized Gell–Mann matrix basis …

We produce two identical keys using, for the first time, entangled trinary quantum systems
(qutrits) for quantum key distribution. The advantage of qutrits over the normally used binary …

We derive a single general Bell inequality which is a sufficient and necessary condition for
the correlation function for N particles to be describable in a local and realistic picture, for the …

Quantum frequency combs from chip-scale integrated sources are promising candidates for
scalable and robust quantum information processing (QIP). However, to use these quantum …

Quantum entanglement of weak interaction gauge bosons produced at colliders can be
explored by computing the corresponding polarization density matrix. To this end, we …