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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Deterministic multi-qubit entanglement in a quantum network
Youpeng Zhong1,2, Hung-Shen Chang1, Audrey Bienfait1,3
1Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA.
Nature
|February 25, 2021
Summary
Researchers developed a quantum network linking superconducting quantum processors. This breakthrough enables deterministic multi-qubit entanglement distribution, crucial for scalable quantum computing and communication networks.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Quantum Communication Networks
Background:
- High-fidelity distributed multi-qubit entanglement is essential for quantum networks.
- Previous deterministic entanglement demonstrations were limited to two qubits.
- Challenges in state-transfer fidelity hindered multi-qubit entanglement distribution.
Purpose of the Study:
- To demonstrate deterministic transfer of quantum states between superconducting quantum nodes.
- To prepare and transfer multi-qubit entangled states, specifically Greenberger-Horne-Zeilinger (GHZ) states.
- To establish a modular architecture for large-scale quantum computing.
Main Methods:
- Constructed a quantum network with two superconducting nodes connected by a coaxial cable.
- Each node contained three interconnected superconducting qubits.
- Implemented direct qubit-to-qubit state transfer via the connecting cable.
Main Results:
- Achieved a state transfer process fidelity of 0.911 ± 0.008 between nodes.
- Successfully transferred a three-qubit GHZ state with 0.656 ± 0.014 fidelity.
- Generated a six-qubit, two-node GHZ state with 0.722 ± 0.021 fidelity, exceeding the multipartite entanglement threshold.
Conclusions:
- The developed quantum network architecture enables coherent linking of superconducting quantum processors.
- Demonstrated deterministic multi-qubit entanglement distribution over a physical link.
- Provides a viable modular approach for constructing large-scale quantum computers.
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