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Measuring entanglement entropy in a quantum many-body system

机译:量子多体系统中的纠缠熵的测量

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摘要

Entanglement is one of the most intriguing features of quantum mechanics. It describes non-local correlations between quantum objects, and is at the heart of quantum information sciences. Entanglement is now being studied in diverse fields ranging from condensed matter to quantum gravity. However, measuring entanglement remains a challenge. This is especially so in systems of interacting delocalized particles, for which a direct experimental measurement of spatial entanglement has been elusive. Here, we measure entanglement in such a system of itinerant particles using quantum interference of many-body twins. Making use of our single-site-resolved control of ultracold bosonic atoms in optical lattices, we prepare two identical copies of a many-body state and interfere them. This enables us to directly measure quantum purity, Renyi entanglement entropy, and mutual information. These experiments pave the way for using entanglement to characterize quantum phases and dynamics of strongly correlated many-body systems.
机译:纠缠是量子力学最吸引人的特征之一。它描述了量子对象之间的非局部相关性,并且是量子信息科学的核心。纠缠现在正在从凝聚态到量子引力的各个领域中进行研究。然而,测量纠缠仍然是一个挑战。在相互作用的离域粒子的系统中尤其如此,对于该系统而言,对空间纠缠的直接实验测量已经难以捉摸。在这里,我们使用多体孪生子的量子干涉来测量这种巡回粒子系统中的纠缠。利用我们对光学晶格中超冷硼原子的单点分辨控制,我们制备了两个相同的多体态副本并对其进行干扰。这使我们能够直接测量量子纯度,人一纠缠熵和互信息。这些实验为使用纠缠来表征强相关的多体系统的量子相和动力学铺平了道路。

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  • 来源
    《Nature》 |2015年第7580期|77-83|共7页
  • 作者单位

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

    Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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