Quantum key distribution based on mid-infrared and telecom band two-color entanglement source

• URL: http://arxiv.org/abs/2408.07552v1
• Date: Wed, 14 Aug 2024 13:40:51 GMT
• Title: Quantum key distribution based on mid-infrared and telecom band two-color entanglement source
• Authors: Wu-Zhen Li, Chun Zhou, Yang Wang, Li Chen, Ren-Hui Chen, Zhao-Qi-Zhi Han, Ming-Yuan Gao, Xiao-Hua Wang, Di-Yuan Zheng, Meng-Yu Xie, Yin-Hai Li, Zhi-Yuan Zhou, Wan-Su Bao, Bao-Sen Shi,
• Abstract summary: This work represents a significant step toward developing all-day global-scale quantum communication networks. A long-distance QKD over 500 km of free-space and 96 km of fiber hybrid channels can be reached simultaneously.
• Score: 12.174049120677292
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Due to the high noise caused by solar background radiation, the existing satellite-based free-space quantum key distribution (QKD) experiments are mainly carried out at night, hindering the establishment of a practical all-day real-time global-scale quantum network. Given that the 3-5 {\mu}m mid-infrared (MIR) band has extremely low solar background radiation and strong scattering resistance, it is one of the ideal bands for free-space quantum communication. Here, firstly, we report on the preparation of a high-quality MIR (3370 nm) and telecom band (1555 nm) two-color polarization-entangled photon source, then we use this source to realize a principle QKD based on free-space and fiber hybrid channels in a laboratory. The theoretical analysis clearly shows that a long-distance QKD over 500 km of free-space and 96 km of fiber hybrid channels can be reached simultaneously. This work represents a significant step toward developing all-day global-scale quantum communication networks.

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