Quantum correlations in dissipative gain–loss systems across exceptional points Federico Roccati, Archak Purkayastha, G. Massimo Palma and Francesco Ciccarello Eur. Phys. J. Spec. Top., 232 11 (2023) 1783-1788 Published online: 04 May 2023 DOI: 10.1140/epjs/s11734-023-00835-3