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Quasi-light Storage for Optical Data Packets
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Quantum teleportation over 143 kilometres using active feed-forward.

Xiao-Song Ma1, Thomas Herbst, Thomas Scheidl

  • 1Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria.

Nature
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Summary

Researchers achieved quantum teleportation of qubits over 143 km using active feed-forward, a crucial step for a global quantum internet. This demonstrates the technology

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Technologies
  • Free-Space Quantum Key Distribution

Background:

  • The quantum internet promises secure communication and enhanced distributed computation.
  • Quantum teleportation is essential for distributing qubits over long distances for a global quantum network.
  • Real-world applications require quantum teleportation with active feed-forward over significant distances.

Purpose of the Study:

  • To demonstrate real-time active feed-forward quantum teleportation over a 143 km free-space optical link.
  • To establish a benchmark for satellite-based quantum communication.
  • To verify the maturity and applicability of quantum teleportation technologies in practical scenarios.

Main Methods:

  • Utilized two free-space optical links (quantum and classical) between the Canary Islands.
  • Employed a frequency-uncorrelated polarization-entangled photon pair source.
  • Integrated ultra-low-noise single-photon detectors and entanglement-assisted clock synchronization.
  • Performed quantum teleportation with active feed-forward and confirmed quality via quantum process tomography.

Main Results:

  • Successfully achieved quantum teleportation of independent qubits over 143 km with active feed-forward.
  • The average teleported state fidelity surpassed the classical limit of two-thirds.
  • Validated the quantum teleportation procedure without feed-forward using complete quantum process tomography.

Conclusions:

  • The experiment demonstrates the feasibility of long-distance quantum teleportation with active feed-forward.
  • This achievement is a significant step towards building a global quantum internet and satellite-based quantum communication.
  • The results confirm the readiness of quantum technologies for real-world deployment.