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<p>Quantum entanglement and quantum steering, as important quantum resources, are of great significance in the field of quantum information science. Toward practical quantum communication, it is essential to distribute Gaussian entanglement and quantum steering through optical fiber channels. Here, we experimentally demonstrate the distribution of deterministic Einstein-Podolsky-Rosen (EPR) entanglement and EPR steering through fiber channels. By transmitting the EPR entangled light and the local oscillator (LO) over independent fiber channels, the excess noise in the quantum channel is reduced. Utilizing this transmission approach, we extend the transmission distance of continuous-variable (CV) entanglement distribution to 60.26 km and that of CV EPR steering to 10.06 km in fiber channels. Our results take a crucial step toward practical quantum communication with CV entanglement and quantum steering in fiber channels.</p>

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Deterministic distribution of Gaussian entanglement and quantum steering through fiber channels

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Yanru Yan,
  • Siyu Ren,
  • Mengyu Zhao,
  • Dongmei Han,
  • Yalin Li,
  • Meihong Wang,
  • Xiaolong Su

摘要

Quantum entanglement and quantum steering, as important quantum resources, are of great significance in the field of quantum information science. Toward practical quantum communication, it is essential to distribute Gaussian entanglement and quantum steering through optical fiber channels. Here, we experimentally demonstrate the distribution of deterministic Einstein-Podolsky-Rosen (EPR) entanglement and EPR steering through fiber channels. By transmitting the EPR entangled light and the local oscillator (LO) over independent fiber channels, the excess noise in the quantum channel is reduced. Utilizing this transmission approach, we extend the transmission distance of continuous-variable (CV) entanglement distribution to 60.26 km and that of CV EPR steering to 10.06 km in fiber channels. Our results take a crucial step toward practical quantum communication with CV entanglement and quantum steering in fiber channels.