Reducible correlations in Dicke states

We apply a simple observation to show that the generalized Dicke states can be determined from their reduced subsystems. In this framework, it is sufficient to calculate the expression for only the diagonal elements of the reduced density matrices in terms of the state coefficients. We prove that the correlation in generalized Dicke states |GD(l)N can be reduced to 2l-partite level. Application to the quantum marginal problem is also discussed.

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