Decoy-State Quantum Key Distribution over a Long-Distance High-Loss Underwater Free-Space Channel

• URL: http://arxiv.org/abs/2004.06708v1
• Date: Tue, 14 Apr 2020 17:57:26 GMT
• Title: Decoy-State Quantum Key Distribution over a Long-Distance High-Loss Underwater Free-Space Channel
• Authors: Cheng-Qiu Hu, Zeng-Quan Yan, Jun Gao, Zhan-Ming Li, Heng Zhou, Jian-Peng Dou, Xian-Min Jin
• Abstract summary: We present an experimental demonstration of underwater decoy-state quantum key distribution against high loss. We are able to for the first time reach a long-distance quantum key distribution that is unconditionally secure and can enable real-life air-sea quantum communication tasks.
• Score: 5.525664664021123
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Atmospheric free space and fiber have been widely exploited as the channels for quantum communication, and have enabled inter-continent and inter-city applications. Air-sea free-space channel, being capable of linking the satellite-based quantum resource and underwater vehicle, has now become the last piece of the puzzle in building global quantum communication network. However, long-distance quantum communication penetrating water up to tens to hundreds of meters is extremely challenging due to the inevitable high loss. Here, we present an experimental demonstration of underwater decoy-state quantum key distribution against high loss, meanwhile keep a low quantum bit error rate less than 2.5% for different distances. By directly modulating blue-green lasers at a high speed of 50MHz and decoy-state protocol, we are able to for the first time reach a long-distance quantum key distribution that is unconditionally secure and can enable real-life air-sea quantum communication tasks. The demonstrated distance, even in coastal water of Jerlov types 2C, is up to 30 meters, about one-order improvement over the proof-in-principle demonstrations in previous experiments, and the channel loss is equivalent to 345-meter-long clean seawater of Jerlov type I, representing a key step forward to practical air-sea quantum communication.

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