Covariance matrices of coherent OAM eigenmodes and TGSM beams share identical structure and zero/nonzero pattern, enabling second-order equivalence under ABCD transformations for arbitrary radial profiles.
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Second-order moment equivalence of twisted Gaussian Schell model beams and orbital angular momentum eigenmodes
Covariance matrices of coherent OAM eigenmodes and TGSM beams share identical structure and zero/nonzero pattern, enabling second-order equivalence under ABCD transformations for arbitrary radial profiles.