Hyperentanglement in structured quantum light

Francesco Graffitti, Vincenzo D'Ambrosio, Massimiliano Proietti, Joseph Ho, Bruno Piccirillo, Corrado De Lisio, Lorenzo Marrucci, Alessandro Fedrizzi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols. Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector vortex structured modes, which in turn carry single-particle entanglement between polarization and orbital angular momentum. Pairing nonlinearity-engineered parametric downconversion in an interferometric scheme with spin-To-orbital-Angular-momentum conversion, we generate highly entangled photon pairs at telecom wavelength that we characterize via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities. While hyperentanglement has been demonstrated before in photonic qubits, here we present a rich entanglement structure involving spectrally and spatially structured light, where three different forms of entanglement coexist in the same biphoton state.

Original languageEnglish
Article number043350
JournalPhysical Review Research
Volume2
Issue number4
DOIs
Publication statusPublished - 9 Dec 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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