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Fast Photon-Mediated Entanglement of Continuously Cooled Trapped Ions for Quantum Networking
Jameson O'Reilly1, George Toh1, Isabella Goetting1
1Duke Quantum Center, Departments of Electrical and Computer Engineering and Physics, <a href="https://ror.org/00py81415">Duke University</a>, Durham, North Carolina 27708, USA.
Physical Review Letters
|September 13, 2024
Summary
Researchers entangled two atomic barium ion qubits using single photons, achieving high fidelity. They also introduced a new cooling method for continuous entanglement at a rate of 250 per second.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Optical Physics
Background:
- Atomic ions are leading candidates for quantum computing due to their long coherence times.
- Efficiently entangling remote qubits is crucial for scalable quantum networks.
- Photon-mediated entanglement offers a pathway for connecting distant quantum processors.
Purpose of the Study:
- To demonstrate high-fidelity entanglement between two trapped atomic barium ion qubits.
- To develop a continuous entanglement generation method for improved quantum computing efficiency.
- To integrate sympathetic cooling for uninterrupted quantum operations.
Main Methods:
- Entangled two cotrapped atomic barium ion qubits using collected single visible photons.
- Interfered photons via an integrated fiber beam splitter and detected coincidences.
- Introduced an ytterbium ion for sympathetic cooling to eliminate recooling interruptions.
Main Results:
- Achieved entanglement of barium ion qubits into a Bell state with an observed fidelity lower bound of F>94%.
- Demonstrated continuous entanglement generation at a rate of 250 entanglement events per second.
- Successfully utilized sympathetic cooling to maintain continuous operation.
Conclusions:
- High-fidelity photon-mediated entanglement between atomic ions is achievable.
- Sympathetic cooling enables continuous, high-rate entanglement crucial for quantum technologies.
- This work advances the development of scalable ion-based quantum information processing.
