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• W2523609917 abstract "A proposed phase-estimation protocol based on measuring the parity of a two-mode squeezed-vacuum state at the output of a Mach-Zehnder interferometer shows that the Cram'er-Rao sensitivity is sub-Heisenberg [P. M. Anisimov et al., Phys. Rev. Lett. 104, 103602 (2010)]. However, these measurements are problematic, making it unclear if this sensitivity can be obtained with a finite number of measurements. This sensitivity is only for a phase near zero, and in this region there is a problem with ambiguity because measurements cannot distinguish the sign of the phase. Here, we consider a finite number of parity measurements and show that an adaptive technique gives a highly accurate phase estimate regardless of the phase. We show that the Heisenberg limit is reachable, where the number of trials needed for mean photon number $overline{n}=1$ is approximately 100. We show that the Cram'er-Rao sensitivity can be achieved approximately, and the estimation is unambiguous in the interval ($ensuremath{-}ensuremath{pi}/2,ensuremath{pi}/2$)." @default.
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• W2523609917 date "2017-05-12" @default.
• W2523609917 modified "2023-10-05" @default.
• W2523609917 title "Adaptive phase estimation with two-mode squeezed vacuum and parity measurement" @default.
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• W2523609917 doi "https://doi.org/10.1103/physreva.95.053837" @default.
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