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We show that Doppler shifts are fundamental in gyroscopes. The implication is that it is then possible to perform frequency estimation rather than phase estimation in a passive gyroscope. By utilizing the ultra-steep gain feature of a liquid crystal light valve, we were able to show that we could beat the standard quantum limit of phase estimation by two orders of magnitude compared to a standard interferometer of the same size.
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John C. Howell, Merav Kahn, Ziv Cohen, Einav Grynszpan, Umberto Bortolozzo, Stefania Residori, "Doppler gyroscopes: Do we really understand the gyroscope?," Proc. SPIE PC12447, Quantum Sensing, Imaging, and Precision Metrology, PC124472Z (9 March 2023); https://doi.org/10.1117/12.2655800