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<p>Photonic quantum information processing in metropolitan quantum networks lays the foundation for cloud quantum computing, secure communication, and the realization of a global quantum internet. This paradigm shift requires on-demand and high-rate generation of flying qubits and their quantum state teleportation over long distances. Despite the last decade has witnessed an impressive progress in the performances of deterministic photon sources, the exploitation of distinct quantum emitters to implement a quantum relay among distant parties has remained elusive. Here, we overcome this challenge by using dissimilar quantum dots whose electronic and optical properties are engineered by light-matter interaction, multi-axial strain and magnetic fields so as to make them suitable for the teleportation of polarization qubits. This is demonstrated in a quantum network harnessing both fiber connections and a 270 m free-space optical link connecting two buildings of the Sapienza University campus in Rome. The protocol exploits GPS-assisted synchronization, ultra-fast single photon detectors as well as stabilization systems that compensate for atmospheric turbulence. The achieved teleportation state fidelity reaches up to 82&#xa0;±&#xa0;1%, above the classical limit by more than 10 standard deviations. Our field demonstration of all-photonic quantum teleportation opens a new route to implement solid-state based quantum relays and builds the foundation for practical quantum networks.</p>

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Quantum teleportation with dissimilar quantum dots over a hybrid quantum network

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月17日

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  • Alessandro Laneve,
  • Giuseppe Ronco,
  • Mattia Beccaceci,
  • Paolo Barigelli,
  • Francesco Salusti,
  • Nicolas Claro-Rodriguez,
  • Giorgio De Pascalis,
  • Alessia Suprano,
  • Leone Chiaudano,
  • Eva Schöll,
  • Lukas Hanschke,
  • Tobias M. Krieger,
  • Quirin Buchinger,
  • Saimon F. Covre da Silva,
  • Julia Neuwirth,
  • Sandra Stroj,
  • Sven Höfling,
  • Tobias Huber-Loyola,
  • Mario A. Usuga Castaneda,
  • Gonzalo Carvacho,
  • Nicolò Spagnolo,
  • Michele B. Rota,
  • Francesco Basso Basset,
  • Armando Rastelli,
  • Fabio Sciarrino,
  • Klaus D. Jöns,
  • Rinaldo Trotta

摘要

Photonic quantum information processing in metropolitan quantum networks lays the foundation for cloud quantum computing, secure communication, and the realization of a global quantum internet. This paradigm shift requires on-demand and high-rate generation of flying qubits and their quantum state teleportation over long distances. Despite the last decade has witnessed an impressive progress in the performances of deterministic photon sources, the exploitation of distinct quantum emitters to implement a quantum relay among distant parties has remained elusive. Here, we overcome this challenge by using dissimilar quantum dots whose electronic and optical properties are engineered by light-matter interaction, multi-axial strain and magnetic fields so as to make them suitable for the teleportation of polarization qubits. This is demonstrated in a quantum network harnessing both fiber connections and a 270 m free-space optical link connecting two buildings of the Sapienza University campus in Rome. The protocol exploits GPS-assisted synchronization, ultra-fast single photon detectors as well as stabilization systems that compensate for atmospheric turbulence. The achieved teleportation state fidelity reaches up to 82 ± 1%, above the classical limit by more than 10 standard deviations. Our field demonstration of all-photonic quantum teleportation opens a new route to implement solid-state based quantum relays and builds the foundation for practical quantum networks.