发表机构
University of Sussex; Sorbonne Université; CNRS; LIP6（萨塞克斯大学; 索邦大学; 法国国家科学研究中心; LIP6实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出将小型抗损耗纠缠态与多通干涉测量结合的混合策略，解决大尺寸纠缠态的实验挑战，可实现测量精度显著提升，且现有技术可验证其性能增益。
AI 中文摘要
量子计量学通常利用纠缠态实现超越标准量子极限的测量精度，该优势随纠缠态规模增大而提升，但生成和保存大尺寸纠缠态仍是重大实验挑战。多通协议提供了替代方案，其让单个探测系统与待测参数反复相互作用，然而性能极易受损耗影响，损耗会随连续通数累积，迅速削弱量子优势。本文提出一种混合策略，将小型抗损耗纠缠态与多通干涉测量结合，该方法既保留小型纠缠探测系统的鲁棒性，又通过反复相互作用实现测量精度的显著提升。此外，本文提出基于现有可用技术的具体实现方案，证明预测的性能增益可通过现有实验能力实现。
英文摘要
Quantum metrology typically uses entangled states to achieve measurement precisions beyond the standard quantum limit. The advantage increases with the size of the entangled state, however generating and preserving large entangled states remains a major experimental challenge. Multipass protocols offer an alternative approach by allowing a single probe to interact repeatedly with the parameter of interest, but their performance is highly susceptible to loss, which accumulates over successive passes and rapidly erodes the quantum advantage. Here we introduce a hybrid strategy that combines small, loss-resilient entangled states with multipass interferometry. We show that this approach retains the robustness of small entangled probes while exploiting repeated interactions to achieve substantial enhancements in measurement precision. Furthermore, we propose a concrete implementation using currently available technologies, demonstrating that the predicted performance gains should be experimentally accessible with existing capabilities.
Comments5 pages, 6 figures
