• Photonics Research
  • Vol. 7, Issue 8, 08000A40 (2019)
Cheng-Qiu Hu1、2, Zeng-Quan Yan1、2, Jun Gao1、2, Zhi-Qiang Jiao1、2, Zhan-Ming Li1、2, Wei-Guan Shen1、2, Yuan Chen1、2, Ruo-Jing Ren1、2, Lu-Feng Qiao1、2, Ai-Lin Yang1、2, Hao Tang1、2, and Xian-Min Jin1、2、*
Author Affiliations
  • 1School of Physics and Astronomy, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
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    Abstract

    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.
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    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. Transmission of photonic polarization states through 55-m water: towards air-to-sea quantum communication[J]. Photonics Research, 2019, 7(8): 08000A40
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    Special Issue: Quantum Photonics
    Received: Apr. 3, 2019
    Accepted: Jun. 15, 2019
    Published Online: Jul. 25, 2019
    The Author Email: Xian-Min Jin (xianmin.jin@sjtu.edu.cn)