A cospectral non-Hermitian trimer with nonreciprocal couplings admits exact dark-bright decomposition under an algebraic matching condition, with the bright sector becoming PT-symmetric and hosting an embedded second-order exceptional point at criticality.
Chiral quantum optics,
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Latent symmetry in a minimal non-Hermitian trimer
A cospectral non-Hermitian trimer with nonreciprocal couplings admits exact dark-bright decomposition under an algebraic matching condition, with the bright sector becoming PT-symmetric and hosting an embedded second-order exceptional point at criticality.