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Updated: Nov 8, 2025
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.8K
Metrological complementarity reveals the Einstein-Podolsky-Rosen paradox
Benjamin Yadin1,2, Matteo Fadel3, Manuel Gessner4
1School of Mathematical Sciences and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, University of Nottingham, Nottingham, UK.
Nature Communications
|April 24, 2021
Summary
Quantum steering, a phenomenon stronger than entanglement, is now a valuable resource for quantum metrology. This study shows how the Einstein-Podolsky-Rosen paradox enables precise measurements and detects steering in quantum states.
Area of Science:
- Quantum mechanics
- Quantum information theory
- Quantum metrology
Background:
- The Einstein-Podolsky-Rosen (EPR) paradox highlights nonclassical correlations in quantum mechanics.
- Quantum steering, a phenomenon exceeding entanglement, is recognized as a resource in quantum information.
- The role of steering in quantum metrology has remained largely unexplored.
Purpose of the Study:
- To investigate the role of quantum steering in quantum metrology.
- To formulate the EPR paradox within the framework of quantum metrology.
- To identify steering as a resource for precision measurements.
Main Methods:
- Formulating the EPR paradox in quantum metrology.
- Deriving a criterion based on quantum Fisher information.
- Utilizing a stricter formulation of quantum complementarity.
Main Results:
- Demonstrated that the EPR paradox enables precise estimation of local phase shifts and their generating observable.
- Developed a quantum Fisher information-based criterion to detect steering.
- Showed that this criterion detects steering in a broader range of quantum states compared to existing methods.
- Identified steering as a useful resource for quantum-enhanced precision measurements.
Conclusions:
- Quantum steering is a valuable resource for quantum metrology, enabling enhanced precision measurements.
- The developed criterion effectively detects steering, including in non-Gaussian states relevant to current experiments.
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