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

• 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.

Nyckelord

quantum-state tomography

discrete wigner function

separability criterion

ensembles

information

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