Transmission of photonic polarization states through 55-m water: towards air-to-sea quantum communication

作     者：CHENG-QIU HU ZENG-QUAN YAN JUN GAO ZHI-QIANG JIAO ZHAN-MING LI WEI-GUAN SHEN YUAN CHEN RUO-JING REN LU-FENG QIAO AI-LIN YANG HAO TANG XIAN-MIN JIN 

作者机构：School of Physics and AstronomyState Key Laboratory of Advanced Optical Communication Systems and NetworksShanghai Jiao Tong UniversityShanghai200240China Synergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei230026China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2019年第7卷第8期

页      面：800-804页

核心收录：

学科分类：11[军事学] 1105[军事学-军队指挥学] 07[理学] 0839[工学-网络空间安全] 08[工学] 070201[理学-理论物理] 110505[军事学-密码学] 110503[军事学-军事通信学] 0702[理学-物理学] 

基　　金：National Basic Research Program of China(973 Program)(2017YFA0303700) National Natural Science Foundation of China(NSFC)(61734005,11761141014,11690033) Science and Technology Commission of Shanghai Municipality(STCSM)(15QA1402200,16JC1400405,17JC1400403) Shanghai Municipal Education Commission(SMEC)(16SG09,2017-01-07-00-02-E00049) 

主　　题：QKD Transmission photonic polarization towards air-to-sea quantum communication 

摘      要：Quantum communication has been rapidly developed due to its unconditional security and successfully implemented through optical fibers and free-space air in experiments. To build a complete quantum communication network involving satellites in space and submersibles in ocean, the underwater quantum channel has been investigated in both theory and experiment. However, the question of whether the polarization encoded qubit can survive through a long-distance and high-loss underwater channel, which is considered as the restricted area for satellite-borne radio waves, still remains. Here, we experimentally demonstrate the transmission of blue-green photonic polarization states through 55-m-long water. We prepare six universal quantum states at the single photon level and observe their faithful transmission in a large marine test platform. We obtain complete information of the channel by quantum process tomography. The distance demonstrated in this work reaches a region allowing potential real applications, representing a step further towards air-to-sea quantum communication.