The Quantum State Revisited.
Sorgente A., Sette M., Figliolia M.
VII - Didattica e storia della fisica
Aula GSSI Ex ISEF - Sala Rossa - Giovedì 26 h 09:00 - 12:30
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What does the quantum state really mean? It is well known that some physicists assume that the state vector itself is a real property of the system, while others consider that it is merely an expression of our knowledge of the system. Still others even claim that we should altogether drop the question of what state refers to in the real world. Bohr argued that we cannot meaningfully speak about what is going on at the quantum level at all. In his perspective, it represents only an abstract physical description, whereas the physics concerns what we can say about nature. However, this approach may be unacceptable since physical theories should have something to say about what nature really is, and not just be a prescription of what we can say about nature. In this contribution, we critically analyze the concept of state, starting from the classical physics, via a careful reasoning about its meaning. In particular, we discuss how the entanglement may be used to introduce this concept allowing to manage in a simple way a complex quantum concept. We find this approach suitable for an exposition at high-school level since we believe that the subject is highly educational to promote the scientific attitude and it is also interesting from a philosophical point of view for a teenager.