Application range of crosstalk-affected spatial demultiplexing for resolving separations between unbalanced sources
arXiv:2211.09157 · doi:10.1088/1367-2630/ad0173
Abstract
Superresolution is one of the key issues at the crossroads of contemporary quantum optics and metrology. Recently, it was shown that for an idealized case of two balanced sources, spatial mode demultiplexing (SPADE) achieves resolution better than direct imaging even in the presence of measurement crosstalk [Phys. Rev. Lett. 125, 100501 (2020)]. In this work, we consider arbitrarily unbalanced sources and provide a systematic analysis of the impact of crosstalk on the resolution obtained from SPADE. As we dissect, in this generalized scenario, SPADE's effectiveness depends non-trivially on the strength of crosstalk, relative brightness and the separation between the sources. In particular, for any source imbalance, SPADE performs worse than ideal direct imaging in the asymptotic limit of vanishing source separations. Nonetheless, for realistic values of crosstalk strength, SPADE is still the superior method for several orders of magnitude of source separations.
arXiv comment10 pages, 6 figures
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- Superresolving optical ruler based on spatial mode demultiplexing for systems evolving under Brownian motion
- Quantum-inspired exoplanet detection in the presence of experimental imperfections