https://doi.org/10.1140/epjst/e2008-00695-9
What has a symmetry violation in particle physics to do with non-locality?
Institut für Theoretische Physik, Universität Wien, Boltzmanngasse 5, 1090 Vienna, Austria
Particle physics has become an interesting
testing ground for fundamental questions of quantum
mechanics (QM). The massive meson-antimeson systems are
specially suitable as they offer a unique laboratory to
test various aspects of particle physics (
violation, 
violation, ...) as well to test
the foundations of QM (local realistic theories versus QM,
Bell inequalities, decoherence effects, quantum marking and
erasure concepts, ...).
We focus here on a surprising connection between the violation of a
symmetry in particle physics –the 
symmetry
(
=charge conjugation, 
=parity)– and
non-locality. This is achieved via Bell inequalities which
discriminate between local realistic theories and QM.
Further we present a decoherence model which can be tested
by accelerator experiments at the DAΦNE (Italy) and at the
KEK-B machine (Japan). We show that there is a simple connection
between a decoherence parameter and different measures of
entanglement, i.e., entanglement of formation and concurrence. In
this way the very basic mathematical and theoretical concepts about
entanglement can be confronted directly with experiments. Similar
decoherence models can also be tested for entangled photon systems
and single neutrons in an interferometer.
© EDP Sciences, Springer-Verlag, 2008
