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Published on: September 5, 2019
Deterministically Entangling Two Remote Atomic Ensembles via Light-Atom Mixed Entanglement Swapping
Yanhong Liu1, Zhihui Yan1,2, Xiaojun Jia1,2
1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, People's Republic of China.
Researchers demonstrate deterministic entanglement of two remote atomic ensembles using continuous-variable entanglement swapping. This advances quantum networks by entangling distant macroscopic objects without direct interaction.
Area of Science:
- Quantum physics
- Quantum information science
- Atomic physics
Background:
- Large-scale quantum networks require entanglement between distant macroscopic objects.
- Entanglement swapping enables entanglement of spatially separated systems without direct interaction.
Purpose of the Study:
- To propose a scheme for deterministically entangling two remote atomic ensembles.
- To utilize continuous-variable entanglement swapping between light-atom quantum systems.
Main Methods:
- Preparing two stationary atomic ensembles in mixed entangled states with light.
- Implementing entanglement swapping via balanced homodyne detection of light.
- Using feedback of measurement results for unconditional entanglement.
Main Results:
- Successfully demonstrated deterministic entanglement between two remote macroscopic atomic ensembles.
- Verified entanglement using the inseparability criterion of correlation variances.
Conclusions:
- The proposed scheme provides a robust method for establishing entanglement in quantum networks.
- This work is crucial for the development of scalable quantum communication and computation.
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