Scholarlink

<p>Noise fundamentally limits quantum communication capacity, completely preventing information transmission in fully depolarizing environments. While indefinite causal order theoretically circumvents this limitation, experimentally realizing multi-channel configurations for genuine quantum transmission remains challenging. Here we show the activation of quantum communication through completely depolarizing channels using a programmable silicon photonic chip. By implementing a superposition of cyclic orders across four completely depolarizing channels, we achieve an output state fidelity of 0.712&#xa0;±&#xa0;0.013, which strictly exceeds the classical threshold of 2/3. This mechanism provides a powerful tool for overcoming extreme noise, offering broad potential for building robust quantum networks in highly decoherent environments.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Cyclic order superpositions enable quantum information transmission through completely depolarizing channels

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月29日

查看全文
  • Yaxin Wang,
  • Linxiang Zhou,
  • Tianfeng Feng,
  • Hanlin Nie,
  • Ying Xia,
  • Tianqi Xiao,
  • Weihu Xu,
  • Juntao Li,
  • Vlatko Vedral,
  • Xiaoqi Zhou

摘要

Noise fundamentally limits quantum communication capacity, completely preventing information transmission in fully depolarizing environments. While indefinite causal order theoretically circumvents this limitation, experimentally realizing multi-channel configurations for genuine quantum transmission remains challenging. Here we show the activation of quantum communication through completely depolarizing channels using a programmable silicon photonic chip. By implementing a superposition of cyclic orders across four completely depolarizing channels, we achieve an output state fidelity of 0.712 ± 0.013, which strictly exceeds the classical threshold of 2/3. This mechanism provides a powerful tool for overcoming extreme noise, offering broad potential for building robust quantum networks in highly decoherent environments.