Quadrature non-Gaussianity and nonzero stellar rank are shown to be witnesses of particle entanglement rather than photon addition, with a generalized basis-dependent stellar rank proposed.
AULBACH, Classification of entanglement in symmetric states
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Non-Gaussianity from superselection rules
Quadrature non-Gaussianity and nonzero stellar rank are shown to be witnesses of particle entanglement rather than photon addition, with a generalized basis-dependent stellar rank proposed.