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Entanglement quantification through local observable correlations

Authors
  • Kothe, Christian
  • Björk, Gunnar
Type
Published Article
Publication Date
Oct 24, 2006
Submission Date
Aug 04, 2006
Identifiers
DOI: 10.1103/PhysRevA.75.012336
arXiv ID: quant-ph/0608041
Source
arXiv
License
Unknown
External links

Abstract

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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