2014/02/28 by Robert Fickler, Radek Łapkiewicz, Radek Lapkiewicz +4 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Angular momentum #Orbital Angular Momentum in Optics #Photon #Photonic and Optical Devices #Photonics #Physics #Quantum #Quantum Information and Cryptography #Quantum entanglement #Quantum information #Quantum mechanics #Quantum network #physics.optics #quant-ph
paper · pdf · doi:10.1038/ncomms5502
published as Nature Communications 5, 4502 (2014) · Journal reference added. Additonal measurements can be found in the journal version. 5 pages incl. 4 figures plus 2 pages supplementary information
openalex publication_date 2014/07/30 · arxiv created 2014/08/06 · arxiv updated 2014/08/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Photonics has become a mature field of quantum information science, where integrated optical circuits offer a way to scale the complexity of the setup as well as the dimensionality of the quantum state. On photonic chips, paths are the natural way to encode information. To distribute those high-dimensional quantum states over large distances, transverse spatial modes, like orbital angular momentum (OAM) possessing Laguerre Gauss modes, are favourable as flying information carriers. Here we demonstrate a quantum interface between these two vibrant photonic fields. We create three-dimensional path entanglement between two photons in a non-linear crystal and use a mode sorter as the quantum interface to transfer the entanglement to the OAM degree of freedom. Thus our results show a novel, flexible way to create high-dimensional spatial mode entanglement. Moreover, they pave the way to implement broad complex quantum networks where high-dimensionally entangled states could be distributed over distant photonic chips.