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Abstract: I propose a new class of interpretations, {\it real world interpretations},of the quantum theory of closed systems. These interpretations postulate apreferred factorization of Hilbert space and preferred projective measurementson one factor. They give a mathematical characterisation of the differentpossible worlds arising in an evolving closed quantum system, in which eachpossible world corresponds to a generally mixed evolving quantum state. In arealistic model, the states corresponding to different worlds should beexpected to tend towards orthogonality as different possible quasiclassicalstructures emerge or as measurement-like interactions produce differentclassical outcomes. However, as the worlds have a precise mathematicaldefinition, real world interpretations need no definition of quasiclassicality,measurement, or other concepts whose imprecision is problematic in otherinterpretational approaches. It is natural to postulate that precisely oneworld is chosen randomly, using the natural probability distribution, as theworld realised in Nature, and that this world-s mathematical characterisationis a complete description of reality.

Autor: Adrian Kent Centre for Quantum Information and Foundations, DAMTP, University of Cambridge and Perimeter Institute


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