Revisit on quantum parameter estimation approach for Mach-Zehnder interferometry

• URL: http://arxiv.org/abs/2503.14306v1
• Date: Tue, 18 Mar 2025 14:45:42 GMT
• Title: Revisit on quantum parameter estimation approach for Mach-Zehnder interferometry
• Authors: Bing-Shu Hu, Xiao-Ming Lu,
• Abstract summary: We analyze different models for estimating relative phase shift in a general two-arm Mach-Zehnder interferometer.<n>We apply the quantum Fisher information approach to analyze the Mach-Zehnder interferometer with the an input state composed of a displaced squeezed vacuum state.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The Mach-Zehnder interferometer is a fundamental tool for measuring phase shifts between two light paths, serving as a crucial prototype for achieving high-precision measurements in various scientific and technological applications. In this study, we analyze different models for estimating relative phase shift in a general two-arm Mach-Zehnder interferometer. We demonstrated that single-parameter estimation models can be reduced from the two-parameter estimation model by imposing appropriate constraints on the parameter space. To make quantum Fisher information of the single-parameter estimation models meaningful, the corresponding constraints must be guaranteed in the experiment implementation. Furthermore, we apply the quantum Fisher information approach to analyze the Mach-Zehnder interferometer with the an input state composed of a displaced squeezed vacuum state and a coherent state, providing insights into the precision limits of such configurations.

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