Quantum Metrology Assisted by Abstention

TitleQuantum Metrology Assisted by Abstention
Publication TypeJournal Article
Year of Publication2013
AuthorsGendra, B, Ronco-Bonvehi, E, Calsamiglia, J, Muñoz-Tapia, R, Bagan, E
JournalPhysical Review Letters
Date Published3/2013

The main goal of quantum metrology is to obtain accurate values of physical parameters using quantum probes. In this context, we show that abstention, i.e., the possibility of getting an inconclusive answer at readout, can drastically improve the measurement precision and even lead to a change in its asymptotic behavior, from the shot-noise to the Heisenberg scaling. We focus on phase estimation and quantify the required amount of abstention for a given precision. We also develop analytical tools to obtain the asymptotic behavior of the precision and required rate of abstention for arbitrary pure states.

Short TitlePhys. Rev. Lett.
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