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The neutral kaon system offers a unique possibility to perform fundamental tests of the basic principles of quantum mechanics and of CPT symmetry. The most recent limits obtained by the KLOE experiment at the DAΦNE e+e- collider on several kinds of possible decoherence and CPT violation mechanisms, which in some cases might be justified in a quantum gravity framework, are reviewed. No deviation from the expectations of quantum mechanics and CPT symmetry is observed, while the precision of the measurements, in some cases, reaches the interesting Planck scale region. Finally, prospects for this kind of experimental studies at KLOE-2 are presented. [ABSTRACT FROM AUTHOR]

Foundations of Quantum Mechanics can be tested as well for systems at high energy scales. Here we present a concise formalism which allows to discuss observables in typical accelerator experiments from an information theoretic view. In particular, we show how the difference of a world of matter and a world of antimatter, the famous CP violation, changes the information theoretic content of the neutral kaon system. [ABSTRACT FROM AUTHOR]