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. 2016 Nov 9;7:13251. doi: 10.1038/ncomms13251

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Copyright © 2016, The Author(s)

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(a) Three-photon GHZ state (left column) and ideal case (right column). (b) Four-photon GHZ state (left column) and ideal case (right column). Top row corresponds to the real parts and bottom row corresponds to the imaginary parts. The density matrix elements are given by ρ_ij=〈i|ρ_exp|j〉, where ρ_exp is the reconstructed experimental density matrix.