Experimental determination of multipartite entanglement with incomplete information
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Data
2015
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Resumo
Multipartite entanglement is very poorly understood despite all the theoretical and experimental
advances of the last decades. Preparation, manipulation, and identification of this resource is crucial for
both practical and fundamental reasons. However, the difficulty in the practical manipulation and the
complexity of the data generated by measurements on these systems increase rapidly with the number of
parties. Therefore, we would like to experimentally address the problem of how much information about
multipartite entanglement we can access with incomplete measurements. In particular, it was shown that
some types of pure multipartite entangled states can be witnessed without measuring the correlations
[M. Walter et al., Science 340, 1205 (2013)] between parties, which is strongly demanding experimentally.
We explore this method using an optical setup that permits the preparation and the complete tomographic
reconstruction of many inequivalent classes of three- and four-partite entangled states, and compare
complete versus incomplete information. We show that the method is useful in practice, even for nonpure
states or nonideal measurement conditions
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Optics, Quantum physics, Quantum information
Citação
AGUILAR, G. H.; WALBORN, S. P.; RIBEIRO, P. H. Souto; CÉLERI, L. C. Experimental determination of multipartite entanglement with incomplete information. Physical Review X, New York, v. 5, p. 031042, 2015.