For half-Gaussian priors on two-point separation, SPADE is close to optimal only for small separations; direct imaging can outperform SPADE for intermediate prior means.
Quantum theory of superresolution for two incoher- ent optical point sources,
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Bayesian quantum estimation of the separation of two incoherent point sources
For half-Gaussian priors on two-point separation, SPADE is close to optimal only for small separations; direct imaging can outperform SPADE for intermediate prior means.