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Superresolution imaging of two incoherent optical sources with unequal brightnesses
Published 26 Apr 2024 in quant-ph | (2404.17463v1)
Abstract: Resolving the separation between two incoherent optical sources with high precision is of great significance for fluorescence imaging and astronomical observations. In this paper, we focus on a more general scenario where two sources have unequal brightnesses. We give the ultimate precision limit with respect to separation by using the quantum Fisher information. Through the calculation of the classical Fisher information, we analyze and compare several specific measurement schemes including direct measurement, Gaussian mode measurement and zero-photon measurement. The results indicate that Gaussian mode measurement is the nearly optimal for a small separation. Our work provides a positive complement to the aspect of superresolution imaging of incoherent sources.
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