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Updated: Oct 25, 2025
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Optimal Entanglement Witnesses: A Scalable Data-Driven Approach
Irénée Frérot1,2, Tommaso Roscilde3
1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Avenida Carl Friedrich Gauss 3, 08860 Barcelona, Spain.
Physical Review Letters
|August 6, 2021
Summary
We developed a new method to certify multipartite entanglement in quantum data. This approach efficiently determines if quantum states are entangled, overcoming limitations of current entanglement witnessing techniques.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Statistical Mechanics
Background:
- Multipartite entanglement is crucial for quantum device performance.
- Entanglement certification is essential for verifying quantum advantage.
- Existing entanglement witnessing methods are limited to specific entangled states.
Purpose of the Study:
- To develop a scalable method for certifying multipartite entanglement from finite quantum data.
- To ascertain compatibility of quantum data with separable states.
- To generate optimal entanglement witnesses for given quantum data.
Main Methods:
- Mapping separable quantum states to equilibrium classical field theories on a lattice.
- Transforming the compatibility problem into an inverse statistical problem.
- Solving the inverse statistical problem in polynomial time for non-glassy systems.
Main Results:
- A novel approach to effectively certify entanglement from quantum data.
- The method identifies if a dataset is compatible with a separable state.
- Optimal entanglement witnesses are generated when separability is disproven.
Conclusions:
- The proposed method enables systematic entanglement certification in quantum devices.
- This approach is optimized with respect to accessible observables.
- It offers a scalable solution for assessing quantum advantage.
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