Scholarlink

<p>The discrepancy between theoretical models and experimental implementations introduces side-channel vulnerabilities that pose the most critical threat to quantum cryptography systems. Device-independent quantum key distribution (DIQKD) enables two legitimate users to achieve secure key sharing using untrusted devices through the violation of Bell inequalities. Despite recent DIQKD demonstrations, achieving high efficiency and long-distance transmission remains a formidable challenge. We introduce a novel multiplexing-enhanced heralding protocol, transforming loss scaling from <i>O</i>(<i>η</i><sub><i>L</i></sub>) to <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(O({{\sqrt{\eta_{L}}}})\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mi>O</mi> <mo stretchy="false">(</mo> <mrow> <mrow> <msqrt> <msub> <mi>η</mi> <mrow> <mi>L</mi> </mrow> </msub> </msqrt> </mrow> </mrow> <mo stretchy="false">)</mo> </math></EquationSource> </InlineEquation>, thereby enabling significantly higher secure key rates. Our work achieves a remarkable system-level breakthrough, surpassing the repeaterless bound at long distances and marks a substantial advancement toward practical DIQKD implementation.</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

Multiplexing-enhanced device-independent quantum key distribution

  • 期刊论文

  • 发表日期：

    2026年3月2日

查看全文
  • Shi-Gen Li,
  • Chen-Long Li,
  • Jing-Wei Bian,
  • Zhiguo Huang,
  • Hua-Lei Yin,
  • Zeng-Bing Chen

摘要

The discrepancy between theoretical models and experimental implementations introduces side-channel vulnerabilities that pose the most critical threat to quantum cryptography systems. Device-independent quantum key distribution (DIQKD) enables two legitimate users to achieve secure key sharing using untrusted devices through the violation of Bell inequalities. Despite recent DIQKD demonstrations, achieving high efficiency and long-distance transmission remains a formidable challenge. We introduce a novel multiplexing-enhanced heralding protocol, transforming loss scaling from O(ηL) to \(O({{\sqrt{\eta_{L}}}})\) O ( η L ) , thereby enabling significantly higher secure key rates. Our work achieves a remarkable system-level breakthrough, surpassing the repeaterless bound at long distances and marks a substantial advancement toward practical DIQKD implementation.