# Theoretical Physics

**24 July 2013**

**Time:**15:00

**Location:**EC Stoner SR 8.62

Apy Vourdas (Bradford)

Subsystems of a quantum system and contextuality

The finite set of subsystems of a finite quantum system is studied as a lattice. The physical meaning of the logical connectives is discussed. Contextuality in this formalism is shown to be linked to chains in the lattice. Logical Bell inequalities are shown to be violated, proving that quantum mechanics is a contextual theory. The formalism is also applied to the infinite set of all finite quantum systems.

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