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00925njm 22002777a 4500 dc Řeháček, J. author Stoklasa, Bohumil author Koutný, Dominik author Hradil, Zdenek author Sánchez Soto, Luis Lorenzo author 2019-11-07 We derive fundamental precision bounds for single-point axial localization. For Gaussian beams, this ultimate limit can be achieved with a single intensity scan, provided the camera is placed at one of two optimal transverse detection planes. Hence, for axial localization there is no need of more complicated detection schemes. The theory is verified with an experimental demonstration of axial resolution 3 orders of magnitude below the classical depth of focus. 0031-9007 10.1103/PhysRevLett.123.193601 https://hdl.handle.net/20.500.14352/6020 http://dx.doi.org/10.1103/PhysRevLett.123.193601 https://journals.aps.org Intensity-based axial localization at the quantum limit