Probabilistic metrology or how some measurement outcomes render ultra-precise estimates

TitleProbabilistic metrology or how some measurement outcomes render ultra-precise estimates
Publication TypeJournal Article
Year of Publication2016
AuthorsCalsamiglia, J, Gendra, B, Muñoz-Tapia, R, Bagan, E
JournalNew Journal of Physics
Volume18
Pagination103049
Date PublishedJan-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. 

URLhttp://stacks.iop.org/1367-2630/18/i=10/a=103049?key=crossref.fb78efa5084e8d9fdb51f574cf3bfed3http://stacks.iop.org/1367-2630/18/i=10/a=103049/pdfhttp://stacks.iop.org/1367-2630/18/i=10/a=103049?key=crossref.fb78efa5084e8d9fdb51f574cf3bfed3
DOI10.1088/1367-2630/18/10/103049
Short TitleNew J. Phys.
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