Quantum estimation of rotational speed in optomechanics

We study the quantum Fisher information (QFI) of the angular velocity of rotation in an optomechanical system. Based on the Gaussian measurements method, we derive the explicit form of a single-mode Gaussian QFI, which is valid for arbitrary angular velocity of rotation. The information about the an...

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Bibliographic Details
Published inChinese physics B Vol. 32; no. 10; pp. 100602 - 426
Main Authors Li, Hao, Cheng, Jiong
Format Journal Article
LanguageEnglish
Published Chinese Physical Society and IOP Publishing Ltd 01.10.2023
Subjects
Fisher information
optomechanical system
optomechanical system
Fisher information
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/ace3b7

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Summary:We study the quantum Fisher information (QFI) of the angular velocity of rotation in an optomechanical system. Based on the Gaussian measurements method, we derive the explicit form of a single-mode Gaussian QFI, which is valid for arbitrary angular velocity of rotation. The information about the angular velocity to be measured is contained in the optical covariance matrix, which can be experimentally determined via homodyne measurement. We find that QFI increases rapidly when driving the system close to the unstable boundary. This result can be attributed to the strong nonlinearity of the system at the unstable boundary. Our results indicate the possibility of using an optomechanical system for high precision detection of the angular velocity of rotation.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/ace3b7