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arXiv · 1908.04988

Metasurface interferometry towards quantum sensors

Philip Georgi·Marcello Massaro·Kai-Hong Luo·Basudeb Sain·Nicola Montaut·Harald Herrmann·Thomas Weiss·Guixin Li·Christine Silberhorn·Thomas Zentgraf
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Abstract

Optical metasurfaces open new avenues for precise wavefront control of light for integrated quantum technology. Here, we demonstrate a hybrid integrated quantum photonic system that is capable to entangle and disentangle two-photon spin states at a dielectric metasurface. By interfering single-photon pairs at a nanostructured dielectric metasurface, a path-entangled two-photon NOON state with circular polarization is generated that exhibits a quantum HOM interference visibility of 86 $\pm$ 4%. Furthermore, we demonstrate nonclassicality and phase sensitivity in a metasurface-based interferometer with a fringe visibility of 86.8 $\pm$ 1.1 % in the coincidence counts. This high visibility proves the metasurface-induced path entanglement inside the interferometer. Our findings provide a promising way to hybrid-integrated quantum technology with high-dimensional functionalities in various applications like imaging, sensing, and computing.

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Philip Georgi, Marcello Massaro, Kai-Hong Luo, Basudeb Sain, Nicola Montaut, Harald Herrmann, Thomas Weiss, Guixin Li, Christine Silberhorn, Thomas Zentgraf. 2019-08-14. Metasurface interferometry towards quantum sensors. https://doi.org/10.1038/s41377-019-0182-6

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