Higher-order covariance matrices of quadrature monomials let Gaussian operations act on non-Gaussian CV states by small-matrix multiplications and support witnesses such as nonlinear squeezing.
Hierarchy of nonlinear entanglement dynamics for continuous vari- ables.Phys
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Higher-order covariance matrices for non-Gaussian quantum states
Higher-order covariance matrices of quadrature monomials let Gaussian operations act on non-Gaussian CV states by small-matrix multiplications and support witnesses such as nonlinear squeezing.