Quantum states made to measure

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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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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