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Updated: Sep 9, 2025
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
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Quantum metrology with a continuous-variable system
Matteo Fadel1, Noah Roux1, Manuel Gessner2
1Department of Physics, ETH Zürich 8093 Zürich, Switzerland.
Reports on Progress in Physics. Physical Society (Great Britain)
|August 29, 2025
Summary
Quantum metrology enhances measurement precision using quantum information. This study explores precision limits and optimal strategies for continuous-variable quantum sensing, focusing on displacement and rotation estimation.
Area of Science:
- Quantum physics
- Quantum information science
- Metrology and sensing
Background:
- Quantum metrology leverages quantum information to surpass classical measurement precision limits.
- Key strategies involve preparing nonclassical quantum states and designing optimal measurement observables.
- Continuous-variable quantum systems offer a promising platform for advanced sensing applications.
Purpose of the Study:
- To investigate precision limits and optimal strategies in quantum metrology and sensing using single modes of quantum continuous variables.
- To analyze the estimation of displacements and rotations, crucial parameters in various quantum technologies.
- To compare fundamental precision limits with practical estimation strategies.
Main Methods:
- Analysis of precision limits using quantum Fisher information.
- Evaluation of sensitivities for Gaussian states and superpositions of Fock or coherent states.
- Comparison of quantum-limited precision with moment-based estimation using various measurement observables (homodyne, photon number, parity).
Main Results:
- Quantification of precision limits for estimating displacements and rotations in continuous-variable systems.
- Assessment of the performance of different quantum states (Gaussian, Fock, coherent state superpositions) in sensing.
- Comparison between theoretical quantum precision limits and practical estimation strategies, highlighting the impact of measurement choices.
Conclusions:
- Optimal strategies and fundamental precision limits in continuous-variable quantum metrology are identified.
- The study provides insights into the practical feasibility of achieving high-precision measurements using current and emerging quantum platforms.
- Results are relevant for diverse experimental systems, including quantum light, trapped ions, and mechanical oscillators.
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