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   Three-dimensional (3D) displays allow users to experience 2D images/videos in-depth illusions. Among the different 3D displays, we can distinguish the Pepper ghost illusion, which is a common approach to create a 3D hologram without goggles. In this work, we have upgraded the conventional Pepper ghost illusion, named as the two-way Pepper ghost tunnel, to create two simultaneous holograms. Contrary to the conventional Pepper ghost, the Pepper ghost tunnel requires two liquid crystal displays (LCDs), which are controlled by the same Arduino, to illuminate a 45-deg transparency sheet in both directions, allowing two different holograms to be viewed from each side of the tunnel. We have described a practical procedure for building the apparatus and validate its performance. Due to the simplicity of the apparatus, the Pepper Ghost tunnel allows undergraduate students to increase their knowledge in geometrical Optics and its integration with electrical circuits 

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3. Debugging the OmniTable Way

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   Oliver, R.; Blau, M.; Gaeta, A. L. (April 2022, CLEO: QELS_Fundamental Science 2022)

   We perform classical unitary conversion between three frequencies mediated by Bragg-scattering four-wave mixing with three pump fields. In the quantum regime, such a scheme can be scaled to realize N-frequency-bin W-states and boson sampling. 

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