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Temporally Multimode Ion-Ion Entanglement over 1.2 Kilometer Fibers
1Tsinghua University, Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Beijing 100084, People's Republic of China.
Physical Review Letters
|July 26, 2026
Summary
Researchers demonstrate a new method for faster, high-fidelity entanglement between trapped-ion quantum network nodes. This advance in quantum networks and repeaters speeds up entanglement distribution over long distances.
Area of Science:
- Quantum Information Science
- Quantum Communication Networks
Background:
- Quantum networks and repeaters are crucial for distributed quantum computing, long-distance quantum communication, and networked quantum sensing.
- Efficient and high-fidelity heralded entanglement between remote quantum nodes is essential for functional quantum networks.
Purpose of the Study:
- To experimentally demonstrate a multimode-enhanced heralded entanglement scheme.
- To accelerate remote entanglement distribution over long optical fibers using trapped-ion nodes.
Main Methods:
- Utilized a multimode entangling scheme harnessing ten temporal photonic modes.
- Experimentally generated heralded entanglement between two trapped-ion quantum network nodes.
- Employed a dual-type architecture for scalability.
Main Results:
- Achieved a 4.59-fold speedup in ion-ion entanglement generation.
- Attained an entanglement fidelity of 95.9%±1.5% over 1.2 km of optical fiber.
- Demonstrated a scalable system for future quantum networks.
Conclusions:
- The multimode-enhanced heralded entanglement scheme significantly accelerates entanglement distribution.
- The demonstrated system is a key building block for scalable, large-scale quantum networks.
- High-fidelity entanglement over long distances is achievable with this approach.
