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We generalize the theory of resolving a mixture of two closely spacedspontaneous emission lifetimes to include pure dephasing contributions todecoherence, leading to the resurgence of Rayleigh's Curse at small lifetimeseparations. Considerable resolution enhancement remains possible when lifetimebroadening is more significant than that due to pure dephasing. In the limitthat lifetime broadening dominates, one can achieve super-resolution either bya tailored one-photon measurement or Hong-Ou-Mandel interferometry. We describeconditions for which either choice is superior.

Tight information bounds for spontaneous emission lifetime resolution of quantum sources with varied spectral purity