TY - JOUR
T1 - Hyperentanglement in structured quantum light
AU - Graffitti, Francesco
AU - D'Ambrosio, Vincenzo
AU - Proietti, Massimiliano
AU - Ho, Joseph
AU - Piccirillo, Bruno
AU - De Lisio, Corrado
AU - Marrucci, Lorenzo
AU - Fedrizzi, Alessandro
N1 - Publisher Copyright:
© 2020 authors. Published by the American Physical Society.
PY - 2020/12/9
Y1 - 2020/12/9
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85104552518&partnerID=8YFLogxK
U2 - 10.1103/PhysRevResearch.2.043350
DO - 10.1103/PhysRevResearch.2.043350
M3 - Article
AN - SCOPUS:85104552518
SN - 2643-1564
VL - 2
JO - Physical Review Research
JF - Physical Review Research
IS - 4
M1 - 043350
ER -