2018/11/29 by Huan Cao, Cao, Huan, She-Cheng Gao +34
Computer Science · Engineering · Physics and Astronomy · #FOS: Physical sciences #Optical Network Technologies #Orbital Angular Momentum in Optics #Quantum Information and Cryptography #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.1811.12195
10 pages, 4 figures
openalex publication_date 2018/11/29 · openalex created_date 2018/12/11 · arxiv created 2019/10/29 · arxiv updated 2019/10/30 · openalex updated_date 2026/07/28
High-dimensional entanglement has demonstrated potential for increasing channel capacity and resistance to noise in quantum information processing. However, its distribution is a challenging task, imposing a severe restriction on its application. Here we report the first distribution of three-dimensional orbital angular momentum (OAM) entanglement via a 1-km-long optical fibre. Using an actively-stabilizing phase pre-compensation technique, we successfully transport one photon of a three-dimensional OAM entangled photon pair through the fibre. The distributed OAM entangled state still shows a fidelity up to 71% with respect to the three-dimensional maximal-entangled-state (MES). In addition, we certify that the high-dimensional quantum entanglement survives the transportation by violating a generalized Bell inequality, obtaining a violation of ∼3 standard deviations with I3=2.12±0.04. The method we developed can be extended to higher OAM dimension and larger distances in principle. Our results make a significant step towards future OAM-based high-dimensional long-distance quantum communication.