Title | Probabilistic metrology or how some measurement outcomes render ultra-precise estimates |
Publication Type | Journal Article |
Year of Publication | 2016 |
Authors | Calsamiglia, J, Gendra, B, Muñoz-Tapia, R, Bagan, E |
Journal | New Journal of Physics |
Volume | 18 |
Pagination | 103049 |
Date Published | Jan-10-2016 |
Abstract | We show on theoretical grounds that, even in the presence of noise, probabilistic measurement strategies (which have a certain probability of failure or abstention) can provide, upon a heralded successful outcome, estimates with a precision that exceeds the deterministic bounds for the average precision. This establishes a new ultimate bound on the phase estimation precision of particular measurement outcomes (or sequence of outcomes). For probe systems subject to local dephasing, we quantify such precision limit as a function of the probability of failure that can be tolerated. Our results show that the possibility of abstaining can set back the detrimental effects of noise. |
URL | https://stacks.iop.org/1367-2630/18/i=10/a=103049?key=crossref.fb78efa5084e8d9fdb51f574cf3bfed3https://stacks.iop.org/1367-2630/18/i=10/a=103049/pdfhttps://stacks.iop.org/1367-2630/18/i=10/a=103049?key=crossref.fb78efa5084e8d9fdb51f574cf3bfed3 |
DOI | 10.1088/1367-2630/18/10/103049 |
Short Title | New J. Phys. |
