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Abstract We study mixed anomaly between G 1 and G 2 of one-form finite symmetry G 1 × G 2 in 3d Chern-Simons theories. We assign a quantum entanglement structure to two linked G-symmetry lines (Wilson loops) and compute the entanglement entropy S[G]. We find a measure of the mixed anomaly by computing S[G 1 × G 2] − S[G 1] − S[G 2].