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Multispecies Trapped-Ion Node for Quantum Networking.

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Trapped atomic ions offer robust quantum networks. By co-trapping different ion species, researchers achieved necessary isolation for scalable quantum network nodes, enabling both local and remote entanglement.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Networking

Background:

  • Trapped atomic ions are a promising platform for quantum information networks.
  • Existing architectures require isolation between spectator qubits and photonic interface qubits for local and remote operations.
  • Scalable quantum network nodes necessitate efficient methods for qubit isolation.

Purpose of the Study:

  • To demonstrate a method for achieving isolation between different qubit types within a single ion trap node.
  • To showcase the essential components for a scalable ion trap quantum network node.
  • To enable simultaneous local and remote entanglement operations within a quantum network.

Main Methods:

  • Co-trapping of ytterbium-171 (¹⁷¹Yb⁺) and barium-138 (¹³⁸Ba⁺) atomic ions in a single ion trap.
  • Utilizing the collective motion of the co-trapped ions for entanglement.
  • Entangling a ¹³⁸Ba⁺ qubit with an emitted visible photon.

Main Results:

  • Successfully isolated spectator qubit memories (¹⁷¹Yb⁺) from photonic interface qubits (¹³⁸Ba⁺).
  • Demonstrated entanglement of a mixed-species qubit pair via their collective motion.
  • Achieved entanglement between a ¹³⁸Ba⁺ qubit and a photon.

Conclusions:

  • Co-trapping different atomic ion species provides the required isolation for scalable quantum network nodes.
  • This approach facilitates the integration of local and remote entanglement operations within a single quantum network node.
  • The demonstrated techniques are key ingredients for building advanced ion trap quantum networks.