2014/09/30 by S. Gerke, J. Sperling, W. Vogel +4
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.114.050501
published as Phys. Rev. Lett. 114, 050501 (2015) · close to published version, see also viewpoint http://physics.aps.org/articles/v8/10
arxiv created 2015/02/13 · arxiv updated 2015/02/16
An analysis is conducted of the multipartite entanglement for Gaussian states generated by the parametric down-conversion of a femtosecond frequency comb. Using a recently introduced method for constructing optimal entanglement criteria, a family of tests is formulated for mode decompositions that extends beyond the traditional bipartition analyses. A numerical optimization over this family is performed to achieve maximal significance of entanglement verification. For experimentally prepared 4-, 6-, and 10-mode states, full entanglement is certified for all of the 14, 202, and 115974 possible nontrivial partitions, respectively.