Controlling and detecting spin correlations of ultracold atoms in optical lattices.
Controlling and detecting spin correlations of ultracold atoms in optical lattices.
复制标题
DOI：
10.1103/physrevlett.105.265303
复制
发表时间：
2010-09
影响因子：
8.6
通讯作者：
S. Trotzky;Yu-Ao Chen;U. Schnorrberger;P. Cheinet;I. Bloch
中科院分区：
文献类型：
--
作者：
S. Trotzky;Yu-Ao Chen;U. Schnorrberger;P. Cheinet;I. Bloch
我们报道了利用双色光学超晶格控制产生离域有效自旋单态和三态二聚体的价键态。我们演示了单重态和三重态之间的相干耦合，并展示了如何利用超晶格来测量使用自旋阻塞效应的单重态分数。我们的方法为探测和控制超冷原子多体系统中的最近邻自旋关联提供了可靠的方法。能够测量这些关联是研究光学晶格中的量子磁性的重要组成部分。此外，我们还采用了不同三态原子之间的交换操作，从而有效地增加了它们的键长。这样的交换操作为在晶格中大规模并行创建多粒子纠缠态提供了重要的一步。
We report on the controlled creation of a valence bond state of delocalized effective-spin singlet and triplet dimers by means of a bichromatic optical superlattice. We demonstrate a coherent coupling between the singlet and triplet states and show how the superlattice can be employed to measure the singlet-fraction employing a spin-blockade effect. Our method provides a reliable way to detect and control nearest-neighbor spin correlations in many-body systems of ultracold atoms. Being able to measure these correlations is an important ingredient in studying quantum magnetism in optical lattices. We furthermore employ a SWAP operation between atoms which are part of different triplets, thus effectively increasing their bond-length. Such a SWAP operation provides an important step towards the massively parallel creation of a multiparticle entangled state in the lattice.