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    Quantum time reflection and refraction of ultracold atoms

    Time reflection and refraction are temporal analogies of the spatial boundary effects derived from Fermat’s principle. They occur when classical waves strike a time boundary where an abrupt change in the prope...

    Zhaoli Dong, Hang Li, Tuo Wan, Qian Liang, Zhaoju Yang, Bo Yan in Nature Photonics (2024)