Entanglement quantification through local observable correlations
2007 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 75, no 1Article in journal (Refereed) Published
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 is 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.
Place, publisher, year, edition, pages
2007. Vol. 75, no 1
quantum-mechanics, current situation, factorization, computer, state
IdentifiersURN: urn:nbn:se:kth:diva-16356DOI: 10.1103/PhysRevA.75.012336ISI: 000243894100063ScopusID: 2-s2.0-33846674888OAI: oai:DiVA.org:kth-16356DiVA: diva2:334398
QC 201005252010-08-052010-08-052011-05-24Bibliographically approved