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 wave- length 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.

Hyperentanglement in structured quantum light / Graffitti, Francesco; D'Ambrosio, Vincenzo; Proietti, Massimiliano; Ho, Joseph; Piccirillo, Bruno; de Lisio, Corrado; Marrucci, Lorenzo; Fedrizzi, Alessandro. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - 2:4(2020). [10.1103/PhysRevResearch.2.043350]

Hyperentanglement in structured quantum light

D'Ambrosio, Vincenzo;Piccirillo, Bruno;de Lisio, Corrado;Marrucci, Lorenzo;
2020

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 wave- length 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.
2020
Hyperentanglement in structured quantum light / Graffitti, Francesco; D'Ambrosio, Vincenzo; Proietti, Massimiliano; Ho, Joseph; Piccirillo, Bruno; de Lisio, Corrado; Marrucci, Lorenzo; Fedrizzi, Alessandro. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - 2:4(2020). [10.1103/PhysRevResearch.2.043350]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/826773
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