Doppler Gyroscopes: Frequency vs Phase Estimation

John C. Howell, Merav Kahn, Einav Grynszpan, Ziv Roi Cohen, Stefania Residori, Umberto Bortolozzo

Research output: Contribution to journalArticlepeer-review


We consider the fundamental roles of frequency versus phase in parameter estimation, specifically in the Sagnac effect. We describe a novel, ultrasensitive gyroscope based on the extremely steep frequency-dependent gain of a liquid crystal light valve. We provide compelling experimental evidence that the Doppler shift is fundamental in the Sagnac effect giving clarity to a long-debated question. We experimentally show orders of magnitude improvement in sensitivity relative to the standard quantum limit of a gyroscope based on phase estimation.

Original languageAmerican English
Article number113901
JournalPhysical Review Letters
Issue number11
StatePublished - 9 Sep 2022

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© 2022 American Physical Society.


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