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Quantum states made to measure

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Recent progress in manipulating quantum states of light and matter brings quantum-enhanced measurements closer to prospective applications. The current challenge is to make quantum metrologic strategies robust against imperfections.

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Figure 1: A Mach–Zehnder interferometer.
Figure 2: Logarithmic plot of the measurement uncertainty for the probe arm transmission at 100% (black), 90% (red) and 60% (blue).
Figure 3: A pictorial representation of the state of light in a Mach–Zehnder interferometer as a three-component real-space vector, analogous to the Poincaré vector for the polarization state of light.

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Authors and Affiliations

  1. Konrad Banaszek is at the Institute of Theoretical Physics, University of Warsaw, ul. Hoża 69, PL-00-681 Warszawa, Poland konrad.banaszek@fuw.edu.pl,

    Konrad Banaszek

  2. Rafał Demkowicz-Dobrzański is at the Institute of Physics, Nicolaus Copernicus University, ul. Grudziadzka 5, PL-87-100 Toruń, Poland demko@fizyka.umk.pl,

    Rafał Demkowicz-Dobrzański

  3. Ian A. Walmsley is at the Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK. i.walmsely1@physics.ox.ac.uk,

    Ian A. Walmsley

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  1. Konrad Banaszek
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  2. Rafał Demkowicz-Dobrzański
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  3. Ian A. Walmsley
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Banaszek, K., Demkowicz-Dobrzański, R. & Walmsley, I. Quantum states made to measure. Nature Photon 3, 673–676 (2009). https://doi.org/10.1038/nphoton.2009.223

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