Entanglement quantification through local observable correlations

Details Entanglement quantification through local observable correlations Entanglement quantification through local observable correlations

2006-08-04

arxiv.org/abs/quant-ph/0608041v2

Phys. Rev. A 75, 012336 (2007)

Physics

Quantum Physics

5 pages, 3 figures, revised version with new proof and replaced figures

Scientific paper

10.1103/PhysRevA.75.012336

We present a significantly improved scheme of entanglement detection inspired by local uncertainty relations for a system consisting of two qubits. Developing the underlying idea of local uncertainty relations, namely correlations, we demonstrate that it's possible to define a measure which is invariant under local unitary transformations and which is based only on local measurements. It is quite simple to implement experimentally and it allows entanglement quantification in a certain range for mixed states and exactly for pure states, without first obtaining full knowledge (e.g. through tomography) of the state.

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