Local uncertainty relations serving as measures of entanglement in a bipartite two-level system

Details Local uncertainty relations serving as measures of entanglement in a bipartite two-level system Local uncertainty relations serving as measures of entanglement in a bipartite two-level system

2005-08-31

arxiv.org/abs/quant-ph/0508235v1

Physics

Quantum Physics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevA.73.012319

We comment on the recent suggestion to use a family of local uncertainty relations as a standard way of quantifying entanglement in two-qubit systems. Some statements made on the applicability of the proposed "measures" are overly optimistic. We exemplify how these specific "measures" fall short, and present a minor modification of the general theory which uses the same experimentally gathered information, but in a slightly different, better way.

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