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Experimental demonstration improves phase response in quantum sensing using a four-port scatterer.
We construct and characterize a Grover coin with tabletop optics. This directionally unbiased higher-dimensional four-port scatterer replaces a standard beam-splitter in the Michelson interferometer, resulting in a sharper phase response without reducing visibility.
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Schwarze et al. (2025) studied this question.
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