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Frontiers in Optics

Super-resolution Enhanced by Entanglement

Abdelali Sajia, Xiao‐Feng Qian

Published Jan 1, 2022• 0 citations
Publisher

Abstract

We study effects of entanglement on super-resolution of two spatially separated point-sources. It is found to be a key property that can greatly enhance the credibility of super-resolution.
DOI
10.1364/fio.2022.jw5a.40

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We investigate the resolution for imaging two pointlike entangled sources by using the method of moments and spatial-mode demultiplexing, where the pointlike entangled sources can be generated by injecting single-mode sources with arbitrary quantum statistics distribution into an optical parametric amplifier (OPA). We demonstrate that the separation estimation sensitivity is mainly determined by the photon distribution in each detected mode and it can be enhanced by either increasing the squeezed parameter of the OPA or eliminating the relative phase difference of the entangled sources. Furthermore, in the limiting case of infinitely small source separation, the usage of entangled sources can have better resolution than those using incoherent and coherent sources. The results here can find important applications for quantum super-resolution imaging and quantum metrology.