Deterministic super-resolved estimation towards angular displacements based upon a Sagnac interferometer and parity measurement
arXiv:1809.04830 · doi:10.1364/OE.384082
Abstract
Super-resolved angular displacement estimation is of crucial significances for quantum information process and optical lithography. Here we report on and experimentally demonstrate a protocol for angular displacement estimation based on a coherent state containing orbital angular momentum. In the lossless scenario, with using parity measurement, this protocol can theoretically achieve 4-fold super-resolution with quantum number , and shot-noise-limited sensitivity saturating the quantum Cramér-Rao bound. Several realistic factors and their effects are considered, including nonideal state preparation, photon loss, and imperfect detector. Finally, given mean photon number and , we show an angular displacement super-resolution effect with a factor of 7.88, and the sensitivity approaching shot-noise limit is reachable.
arXiv comment9 pages, 9 figures
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