Multiparameter quantum metrology of incoherent point sources: Towards realistic superresolution
By J. Řeháček, Z. Hradil, B. Stoklasa, M. Paúr, J. Grover, A. Kržič, L. Sánchez‐Soto. 2017
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We establish the multiparameter quantum Cram\'er-Rao bound for simultaneously estimating the centroid, the separation, and the relative intensities of two incoherent optical point sources using alinear imaging system. For equally bright sources, the Cram\'er-Rao bound is independent of the source separation, which confirms that the Rayleigh resolution limit is just an artifact of the conventional direct imaging and can be overcome with an adequate strategy. For the general case of unequally bright sources, the amount of information one can gain about the separation falls to zero, but we show that there is always a quadratic improvement in an optimal detection in comparison with the intensity measurements. This advantage can be of utmost important in realistic scenarios, such as observational astronomy.
Subfields: Biomedical Engineering, Biophysics
View Paper: https://www.semanticscholar.org/paper/8f83cc2bbd7003820377f63f19271eed2c88c405
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Citations in the corpus
- Subdiffraction incoherent optical imaging via spatial-mode demultiplexing (2016, background): “[19, 20] requires moments up to the third, and parametric object models with size and shape parameters [8, 38] can also be related to low-order moments.”