Investigating three qubit entanglement with local measurements

Abstract

In this paper we describe how three qubit entanglement can be analyzed with local measurements. For this purpose we decompose entanglement witnesses into operators which can be measured locally. Our decompositions are optimized in the number of measurement settings needed for the measurement of one witness. Our method allows to detect true threepartite entanglement and especially GHZ-states with only four measurement settings.

11 pages and one figure, submitted to the proceedings of the conference "QCS 2002" in Ustron (Poland). v2: Equation (25) corrected

References in corpus (2)

• Experimental detection of entanglement via witness operators and local measurements
• Mean of continuous variables observable {\it via} measurement on single qubit

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