论文标题
纠缠否定性的单密码估计
Single-copies estimation of entanglement negativity
论文作者
论文摘要
纠缠在量子信息处理中起着核心作用，表明量子问题的非本地相关性。但是，很少有有效的方法能检测到未知量子状态的纠缠量。在这项工作中，我们提出了一项计划，以估算复合系统的任何两分部分的纠缠负效率。所提出的方案基于单一拷贝量子状态的随机统一进化和局部测量，与基于同一状态的许多副本的集体测量相比，这比以前的方法更为实用。同时，我们概括了量化总多目标相关性的方案。我们通过理论统计分析和数值模拟证明了该方案的效率。提出的方案非常适合最先进的量子平台，它不仅可以用作推进量子技术的有用基准测试工具，而且还可以作为研究基本量子物理学的探测器，例如纠缠动态。
Entanglement plays a central role in quantum information processing, indicating the non-local correlation of quantum matters. However, few effective ways are known to detect the amount of entanglement of an unknown quantum state. In this work, we propose a scheme to estimate the entanglement negativity of any bi-partition of a composite system. The proposed scheme is based on the random unitary evolution and local measurements on the single-copy quantum states, which is more practical compared with former methods based on collective measurements on many copies of the identical state. Meanwhile, we generalize the scheme to quantify the total multi-partite correlation. We demonstrate the efficiency of the scheme with theoretical statistical analysis and numerical simulations. The proposed scheme is quite suitable for state-of-the-art quantum platforms, which can serve as not only a useful benchmarking tool to advance the quantum technology, but also a probe to study fundamental quantum physics, such as the entanglement dynamics.
