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Verifying multipartite mode entanglement of W states
New Journal of Physics
We construct a method for verifying mode entanglement of N-mode W states. The ideal W state contains exactly one excitation symmetrically shared between N modes, but our method takes the existence of higher numbers of excitations into account, as well as the vacuum state and other deviations from the ideal state. Moreover, our method distinguishes between full N-party entanglement and states with M-party entanglement with M<N, including mixtures of the latter. We specialize to the case N=4 fordoi:10.1088/1367-2630/11/6/063029 fatcat:dserfbsxjvedrnuuu5zrzt6rhi