Exceptional points in non-Hermitian Hamiltonians correspond to multi-block exceptional points in the no-jump Liouvillian; quantum jump terms modify the block structure, demonstrated in qubit and qutrit models with population sinks.
Lidskii, Perturbation theory of non-conjugate oper- ators, Computational Mathematics and Mathematical Physics6, 73 (1966)
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Multi-block exceptional points in open quantum systems
Exceptional points in non-Hermitian Hamiltonians correspond to multi-block exceptional points in the no-jump Liouvillian; quantum jump terms modify the block structure, demonstrated in qubit and qutrit models with population sinks.