Optimal Entropic Uncertainty Relation for Successive Measurements in Quantum Information Theory

Details Optimal Entropic Uncertainty Relation for Successive Measurements in Quantum Information Theory Optimal Entropic Uncertainty Relation for Successive Measurements in Quantum Information Theory

2002-09-02

arxiv.org/abs/quant-ph/0209019v1

Pramana J. Phys. 60 (2003) 1137-1152

Physics

Quantum Physics

17 pages, submitted to Pramana J.Phys

Scientific paper

10.1007/BF02704281

We derive an optimal bound on the sum of entropic uncertainties of two or more observables when they are sequentially measured on the same ensemble of systems. This optimal bound is shown to be greater than or equal to the bounds derived in the literature on the entropic uncertainties of two observables which are measured on distinct but identically prepared ensembles of systems. In the case of a two-dimensional Hilbert Space, the optimal bound for successive measurements of two spin components, is seen to be strictly greater than the optimal bound for the case when they are measured on distinct ensembles, except when the spin components are mutually parallel or perpendicular.

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