Unitarity as preservation of entropy and entanglement in quantum systems

Details Unitarity as preservation of entropy and entanglement in quantum systems Unitarity as preservation of entropy and entanglement in quantum systems

2004-07-15

arxiv.org/abs/quant-ph/0407118v3

Foundations of Physics 36, 477-499 (2006)

Physics

Quantum Physics

To be submitted to the special issue of Foundations of Physics on the occassion of the seventieth birthday of Emilio Santos. v

Scientific paper

10.1007/s10701-005-9035-7

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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