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Device-Independent Entanglement Quantification and Related Applications

Moroder, Tobias
Hofmann, Martin
Gühne, Otfried
Published in Physical Review Letters. 2013, vol. 111, no. 3
Abstract We present a general method to quantify both bipartite and multipartite entanglement in a device-independent manner, meaning that we put a lower bound on the amount of entanglement present in a system based on the observed data only but independent of any quantum description of the employed devices. Some of the bounds we obtain, such as for the Clauser-Horne-Shimony-Holt Bell inequality or the Svetlichny inequality, are shown to be tight. Besides, device-independent entanglement quantification can serve as a basis for numerous tasks. We show in particular that our method provides a rigorous way to construct dimension witnesses, gives new insights into the question whether bound entangled states can violate a Bell inequality, and can be used to construct device-independent entanglement witnesses involving an arbitrary number of parties.
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MORODER, Tobias et al. Device-Independent Entanglement Quantification and Related Applications. In: Physical Review Letters, 2013, vol. 111, n° 3. doi: 10.1103/PhysRevLett.111.030501 https://archive-ouverte.unige.ch/unige:47341

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Deposited on : 2015-02-27

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