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.
Tam- ing numerical errors in simulations of continuous vari- able non-gaussian state preparation.Scientific Re- ports, 12(1), October 2022
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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.