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We demonstrate the unique back-reflections of the optical y-coupler, suggesting applications in multiport interferometry.
We introduce a complete scattering matrix of the Y-coupler, demonstrating the device possesses strong back-reflections at some ports. This unique scattering property enables the construction of the Grover multiport used in super-resolution quantum interferometry.
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Schwarze et al. (2025) studied this question.
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