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Unitarity as preservation of entropy and entanglement in quantum systems

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arxiv quant-ph/0407118 v3 pith:76B64BD7 submitted 2004-07-15 quant-ph

Unitarity as preservation of entropy and entanglement in quantum systems

classification quant-ph
keywords quantumpreservationbeenentanglemententropyevolutionotherprinciples
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The logical structure of Quantum Mechanics (QM) and its relation to other fundamental principles of Nature has been for decades a subject of intensive research. In particular, the question whether the dynamical axiom of QM can be derived from other principles has been often considered. In this contribution, we show that unitary evolutions arise as a consequences of demanding preservation of entropy in the evolution of a single pure quantum system, and preservation of entanglement in the evolution of composite quantum systems.

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