Physics – Quantum Physics
Scientific paper
2002-10-18
J. Mod. Opt. 50 (6-7), 1079-1102, (2003)
Physics
Quantum Physics
24 pages, 2 figures. Contribution to the proceedings of the International Conference on Quantum Information in Oviedo, Spain (
Scientific paper
In this paper we address the problem of detection of entanglement using only few local measurements when some knowledge about the state is given. The idea is based on an optimized decomposition of witness operators into local operators. We discuss two possible ways of optimizing this local decomposition. We present several analytical results and estimates for optimized detection strategies for NPT states of 2x2 and NxM systems, entangled states in 3 qubit systems, and bound entangled states in 3x3 and 2x4 systems.
Bruss Dagmar
Ekert Artur
Guehne Otfried
Hyllus Philipp
Lewenstein Maciej
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