What is "system": the information-theoretic arguments

Details What is "system": the information-theoretic arguments What is "system": the information-theoretic arguments

2006-11-24

arxiv.org/abs/quant-ph/0611250v1

Int J Theor Phys (2008) 47: 805-813

Physics

Quantum Physics

13 pages, no figures

Scientific paper

10.1007/s10773-007-9504-1

The problem of "what is 'system'?" is in the very foundations of modern quantum mechanics. Here, we point out the interest in this topic in the information-theoretic context. E.g., we point out the possibility to manipulate a pair of mutually non-interacting, non-entangled systems to employ entanglement of the newly defined '(sub)systems' consisting the one and the same composite system. Given the different divisions of a composite system into "subsystems", the Hamiltonian of the system may perform in general non-equivalent quantum computations. Redefinition of "subsystems" of a composite system may be regarded as a method for avoiding decoherence in the quantum hardware. In principle, all the notions refer to a composite system as simple as the hydrogen atom.

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