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Heralded entanglement between solid-state qubits separated by three metres.

H Bernien1, B Hensen, W Pfaff

  • 1Kavli Institute of Nanoscience Delft, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.

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Summary
This summary is machine-generated.

Researchers achieved quantum entanglement between two electron spin qubits separated by three meters in diamond. This breakthrough enables robust quantum networks and long-distance quantum communication, advancing quantum information processing.

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Area of Science:

  • Quantum Physics
  • Quantum Information Science

Background:

  • Quantum entanglement links spatially separated objects, defying classical explanations.
  • Entanglement is crucial for quantum information processing, communication, and cryptography.

Purpose of the Study:

  • To demonstrate entanglement between two spatially separated electron spin qubits.
  • To establish a foundation for scalable quantum networks and long-distance quantum communication.

Main Methods:

  • Utilized a protocol creating spin-photon entanglement at each qubit location.
  • Performed a joint measurement on photons to herald qubit entanglement.
  • Verified non-local quantum correlations via single-shot qubit readout.

Main Results:

  • Achieved entanglement of two electron spin qubits with a three-meter spatial separation.
  • Demonstrated robust entanglement generation using a spin-photon interface.
  • Verified non-local quantum correlations confirming the entangled state.

Conclusions:

  • This long-distance entanglement is a key step towards quantum repeaters and deterministic long-distance teleportation.
  • Integration with local nuclear spin registers enables advanced quantum network functionalities.
  • The findings pave the way for extended quantum networks and secure long-distance quantum communication.