Quadripartite quantum steering generated by single-pass cascaded nonlinear processes Y. R. Shen, Y. X. Jiang, X. Y. Cheng, J. W. Lv, Y. B. Yu, G. R. Jin and A. X. Chen EPL, 146 1 (2024) 18002 Published online: 02 April 2024 DOI: 10.1209/0295-5075/ad2ba4