What is "system" : the arguments from the decoherence theory

Details What is "system" : the arguments from the decoherence theory What is "system" : the arguments from the decoherence theory

1999-03-10

arxiv.org/abs/quant-ph/9903037v1

Int.J.Theor.Phys. 45 (2006) 2215-2225

Physics

Quantum Physics

18 (double spaced) pages, no figures

Scientific paper

Within the decoherence theory we investigate the physical background of the condition of the separability (diagonalizability in noncorrelated basis) of the interaction Hamiltonian of the composite system, "system plus environment". It proves that the condition of the separability may serve as a criterion for defining "system", but so that "system" cannot be defined unless it is simultaneously defined with its "environment". When extended to a set of the mutually interacting composite systems, this result implies that the separability conditions of the local interactions are mutually tied. The task of defining "system" (and "environment") via investigating the separability of the Hamiltonian is a sort of the inverse task of the decoherence theory. A simple example of doing the task is given.

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