Air-core fiber distribution of hybrid vector vortex-polarization entangled states

Daniele Cozzolino, Emanuele Polino, Mauro Valeri, Gonzalo Carvacho, Davide Bacco, Nicolò Spagnolo, Leif Katsuo Oxenløwe, Fabio Sciarrino

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Entanglement distribution between distant parties is one of the most important and challenging tasks in quantum communication. Distribution of photonic entangled states using optical fiber links is a fundamental building block towards quantum networks. Among the different degrees of freedom, orbital angular momentum (OAM) is one of the most promising due to its natural capability to encode high dimensional quantum states. In this article, we experimentally demonstrate fiber distribution of hybrid polarization-vector vortex entangled photon pairs. To this end, we exploit a recently developed air-core fiber which supports OAM modes. High fidelity distribution of the entangled states is demonstrated by performing quantum state tomography in the polarization-OAM Hilbert space after fiber propagation, and by violations of Bell inequalities and multipartite entanglement tests. The present results open new scenarios for quantum applications where correlated complex states can be transmitted by exploiting the vectorial nature of light.
Original languageEnglish
Article number046005
JournalAdvanced Photonics
Issue number4
Number of pages9
Publication statusPublished - 2019


  • Orbital angular momentum
  • Quantum communication
  • Structured light
  • Multimode fiber
  • Multipartite entanglement

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