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A quantum-logic gate between distant quantum-network modules.

Severin Daiss1, Stefan Langenfeld2, Stephan Welte2

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Researchers demonstrated a 60-meter quantum logic gate using an ancillary photon. This breakthrough enables remote entanglement of qubits, crucial for scalable quantum networks and computing.

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Area of Science:

  • Quantum Computing
  • Quantum Networks
  • Quantum Information Science

Background:

  • Scalable multi-qubit systems are a major challenge in quantum computing.
  • Quantum networks offer a solution by connecting smaller qubit modules.
  • Distributed quantum computing requires gates between distant qubits.

Purpose of the Study:

  • To experimentally demonstrate a quantum logic gate between distant qubits.
  • To enable remote entanglement creation for distributed quantum computing.

Main Methods:

  • Utilized an ancillary photon reflected successively from two remote qubit modules.
  • Employed heralding photon detection to trigger a final qubit rotation.
  • Implemented a 60-meter distance for the quantum logic gate.

Main Results:

  • Successfully realized a nonlocal quantum logic gate over 60 meters.
  • Demonstrated remote entanglement creation for all four Bell states.
  • Showcased the potential for extending the gate to multiple qubits and modules.

Conclusions:

  • The developed nonlocal quantum logic gate is a key step towards scalable distributed quantum computing.
  • This method facilitates the creation of tailor-made multi-qubit registers for quantum networks.
  • The experimental realization paves the way for robust quantum communication and computation over significant distances.