Efficient distribution of high-dimensional entanglement through 11 km fiber

• DOI: 10.1364/optica.388773
• Publication Date: 2020-06-08T18:30:07Z
• Authors: Xiao-Min Hu; Wen-Bo Xing; Bi-Heng Liu; De-Yong He; Huan Cao; Yu Guo; Chao Zhang; Hao Zhang; Yun-Feng Huang; Chuan-Feng Li; Guang-Can Guo
• Keywords: 0103 physical sciences; 01 natural sciences

High-dimensional entanglement enriches our understanding of and shows many advantages in quantum communications tasks, so its long-distance distribution is a key technology. Here, we use multicore fiber to distribute four-dimensional (4D) over 11 km. The observed fidelity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>F</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.921</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.001</mml:mn> </mml:math> , which feasible for high-dimensional networks. We the violation Bell inequality ( <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi>I</mml:mi> <mml:mn>4</mml:mn> </mml:msub> </mml:mrow> <mml:mn>2.635</mml:mn> <mml:mn>0.014</mml:mn> ) steering <mml:mi>S</mml:mi> <mml:mn>1.900</mml:mn> <mml:mn>0.003</mml:mn> 4D system distance km finally demonstrated based on proof principle. Our work provides an experimental platform technologies enables intracity network.