论文标题
将旋转挤压与颗粒和模式的多部分纠缠标准有关
Relating spin squeezing to multipartite entanglement criteria for particles and modes
论文作者
论文摘要
基于第一和第二矩的纠缠见证人以自旋平方标准的形式存在，用于从集体测量中检测粒子纠缠，并以修改的不确定性关系的形式用于检测模式纠缠或转向。通过揭示它们之间的对应关系，我们表明在阶段上有用的自旋挤压揭示了分布在可寻址模式中的对称自旋状态中的多模纠缠。我们进一步得出了与状态无关的多部分纠缠界限的紧密旋转系数，并指出了它们与依赖状态极化的广泛使用的纠缠标准的联系。我们的结果与最先进的实验有关，其中对称纠缠状态分布在多种可寻址模式中，例如分裂的自旋式玻璃体冷凝物。
Entanglement witnesses based on first and second moments exist in the form of spin-squeezing criteria for the detection of particle entanglement from collective measurements, and in form of modified uncertainty relations for the detection of mode entanglement or steering. By revealing a correspondence between them, we show that metrologically useful spin squeezing reveals multimode entanglement in symmetric spin states that are distributed into addressable modes. We further derive tight state-independent multipartite entanglement bounds on the spin-squeezing coefficient and point out their connection to widely-used entanglement criteria that depend on the state's polarization. Our results are relevant for state-of-the-art experiments where symmetric entangled states are distributed into a number of addressable modes, such as split spin-squeezed Bose-Einstein condensates.
