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We investigate the entanglement patterns of photon-added and -subtractedfour-mode squeezed vacuum states. Entanglements in different scenarios areanalyzed by varying the number of photons added or subtracted in certain modes,which are referred to as the "player" modes, the others being "spectators." Wefind that the photon-subtracted state can give us higher entanglement than thephoton-added state which is in contrast of the two-mode situation. We alsostudy the logarithmic negativity of the two-mode reduced density matrixobtained from the four-mode state which again shows that the state after photonsubtraction can possess higher entanglement than that of the photon-addedstate, and we then compare it to that of the two-mode squeezed vacuum state.Moreover, we examine the non-Gaussianity of the photon-added and -subtractedstates to find that the rich features provided by entanglement cannot becaptured by the measure of non-classicality.

Subtraction better than addition: Entanglement in multimode squeezed vacuum post-interface with photons