Limited Holism and Real-Vector-Space Quantum Theory

Details Limited Holism and Real-Vector-Space Quantum Theory Limited Holism and Real-Vector-Space Quantum Theory

2010-05-26

arxiv.org/abs/1005.4870v1

Physics

Quantum Physics

21 pages

Scientific paper

Quantum theory has the property of "local tomography": the state of any composite system can be reconstructed from the statistics of measurements on the individual components. In this respect the holism of quantum theory is limited. We consider in this paper a class of theories more holistic than quantum theory in that they are constrained only by "bilocal tomography": the state of any composite system is determined by the statistics of measurements on pairs of components. Under a few auxiliary assumptions, we derive certain general features of such theories. In particular, we show how the number of state parameters can depend on the number of perfectly distinguishable states. We also show that real-vector-space quantum theory, while not locally tomographic, is bilocally tomographic.

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