发表机构
University of Bristol（布里斯托大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文在集成光子芯片上演示了利用四模纠缠态对四个相移的线性函数进行分布式量子传感，实现了比散粒噪声极限低0.199分贝的纠缠增强精度，展示了可扩展的集成方案。
AI 中文摘要
分布式量子传感是量子网络的一个新兴应用，其中利用纠缠探针态来感知非定域参数的组合，相对于使用可分离态，其精度得到提高。光压缩态是实验演示纠缠增强传感的主要资源，因为它们可以被确定性地生成和纠缠。现有的分布式量子传感实验由于采用体光学架构，在可扩展性上受到根本限制。与此同时，集成光子学为量子传感器提供了一个可扩展且紧凑的平台。在此，我们展示了在集成光子电路中，对四个相移的线性函数进行纠缠增强传感。我们发现，相对于可分离态的0.041(18)分贝，纠缠增强的精度比散粒噪声极限低0.199(16)分贝。一个四模纠缠态在芯片上生成，纠缠验证和相位传感也在芯片上通过四个集成零差探测器阵列完成。
英文摘要
Distributed quantum sensing is an emerging application of quantum networking, where entangled probe states are employed to sense combinations of delocalized parameters with enhanced precision relative to using separable states. Squeezed states of light are a prime resource for experimental demonstrations of entanglement-enhanced sensing, because they can be generated and entangled deterministically. Existing distributed quantum sensing experiments have been fundamentally limited in scalability due to their bulk-optic architectures. Meanwhile, integrated photonics provides a scalable and compact platform for quantum sensors. Here we demonstrate entanglement-enhanced sensing of linear functions of four phase shifts in an integrated photonic circuit. We find an entanglement-enhanced precision of 0.199(16) dB below the shot noise limit compared to 0.041(18) dB for separable states. A four-mode entangled state is generated on-chip with entanglement verification and phase sensing also performed on-chip with an array of four integrated homodyne detectors.
