Mapping Twisted Light into and out of a Photonic Chip

作     者：Yuan Chen Jun Gao Zhi-Qiang Jiao Ke Sun Wei-Guan Shen Lu-Feng Qiao Hao Tang Xiao-Feng Lin Xian-Min Jin 

作者机构：State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Institute of Natural Sciences Shanghai Jiao Tong University Shanghai 200240 China 

出 版 物：《Physical Review Letters》 (物理评论快报)

年 卷 期：2018年第121卷第23期

页      面：233602-233602页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China, NSFC, (11690033, 11761141014, 61734005) Shanghai Municipal Education Commission, (16SG09, 2017-01-07-00-02-E00049) Science and Technology Commission of Shanghai Municipality, STCSM, (15QA1402200, 16JC1400405, 17JC1400403) National Key Research and Development Program of China, NKRDPC, (2017YFA0303700) Thousand Young Talents Program of China 

主　　题：Angular momentum of light Integrated optics Quantum communication Quantum computation Quantum information processing 

摘      要：Twisted light carrying orbital angular momentum (OAM) provides an additional degree of freedom for modern optics and an emerging resource for both classical and quantum information technologies. Its inherently infinite dimensions can potentially be exploited by using mode multiplexing to enhance data capacity for sustaining the unprecedented growth in big data and internet traffic and can be encoded to build large-scale quantum computing machines in high-dimensional Hilbert space. While the emission of twisted light from the surface of integrated devices to free space has been widely investigated, the transmission and processing inside a photonic chip remain to be addressed. Here, we present the first laser-direct-written waveguide being capable of supporting OAM modes and experimentally demonstrate a faithful mapping of twisted light into and out of a photonic chip. The states OAM0, OAM−1, OAM+1, and their superpositions can transmit through the photonic chip with a total efficiency up to 60% with minimal crosstalk. In addition, we present the transmission of quantum twisted light states of single photons and measure the output states with single-photon imaging. Our results may add OAM as a new degree of freedom to be transmitted and manipulated in a photonic chip for high-capacity communication and high-dimensional quantum information processing.