2020/09/30 by Sergei Slussarenko, Dominick J. Joch, Nora Tischler +5
Computer Science · Physics and Astronomy · #Angular momentum #Orbital Angular Momentum in Optics #Photon #Photon entanglement #Photon polarization #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum entanglement #Quantum information science #Quantum mechanics #Quantum nonlocality #Quantum state #Spontaneous parametric down-conversion #physics.optics #quant-ph
paper · pdf · doi:10.1038/s41534-022-00531-5
published as NPJ Quantum Inf. 8, 20 (2022) · 7 pages, 3 figures
openalex publication_date 2022/03/02 · openalex created_date 2022/03/05 · arxiv created 2022/03/11 · arxiv updated 2022/03/14 · openalex updated_date 2026/08/05
Violating a nonlocality inequality enables the most powerful remote quantum information tasks and fundamental tests of quantum physics. Loophole-free photonic verification of nonlocality has been achieved with polarization-entangled photon pairs, but not with states entangled in other degrees of freedom. Here we demonstrate completion of the quantum steering nonlocality task, with the detection loophole closed, when entanglement is distributed by transmitting a photon in an optical vector vortex state, formed by optical orbital angular momentum (OAM) and polarization. As well as opening up a high-efficiency encoding beyond polarization, the critically-important demonstration of vector vortex steering opens the door to new free-space and satellite-based secure quantum communication devices and device-independent protocols.