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Realization of a multinode quantum network of remote solid-state qubits.

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Researchers built a three-node quantum network using diamond qubits to distribute entangled states. This demonstrates key protocols for a future quantum internet, enabling new technologies.

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Area of Science:

  • Quantum networking
  • Quantum information science
  • Quantum communication

Background:

  • Entangled states are crucial for future quantum technologies.
  • Building multi-node quantum networks is essential for a quantum internet.

Purpose of the Study:

  • To realize a three-node entanglement-based quantum network.
  • To demonstrate key quantum network protocols without postselection.

Main Methods:

  • Utilized remote quantum nodes based on diamond communication qubits.
  • Implemented a scalable phase-stabilized architecture with memory qubits and local quantum logic.
  • Achieved real-time communication and feed-forward gate operations.

Main Results:

  • Successfully distributed genuine multipartite entangled states across three nodes.
  • Demonstrated entanglement swapping through an intermediary node.
  • Operated two quantum network protocols without the need for postselection.

Conclusions:

  • Established a key platform for developing multinode quantum network protocols.
  • Paved the way for testing and advancing a quantum network control stack.
  • Enabled exploration of new quantum technologies reliant on distributed entanglement.