Phys. Rev. A 66, 062305 (2002) [5 pages]

Detection of entanglement with few local measurements

Abstract

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O. Gühne¹, P. Hyllus¹, D. Bruß¹, A. Ekert², M. Lewenstein¹, C. Macchiavello³, and A. Sanpera¹
¹Institut für Theoretische Physik, Universität Hannover, 30167 Hannover, Germany
²Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom
³Dipartimento di Fisica “A. Volta” and INFM-Unitá di Pavia, Via Bassi 6, 27100 Pavia, Italy

Received 15 May 2002; published 9 December 2002

We introduce a general method for the experimental detection of entanglement by performing only few local measurements, assuming some prior knowledge of the density matrix. The idea is based on the minimal decomposition of witness operators into a pseudomixture of local operators. We discuss an experimentally relevant case of two qubits, and show an example how bound entanglement can be detected with few local measurements.

URL:

http://link.aps.org/doi/10.1103/PhysRevA.66.062305

DOI:

10.1103/PhysRevA.66.062305

PACS:

03.67.Dd, 03.65.Ud, 03.67.Hk

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Phys. Rev. A 66, 062305 (2002) [5 pages]

Detection of entanglement with few local measurements