Multiparticle Entanglement with Neutral Atoms in Optical Lattices

我们使用自上而下的方法来研究量子信息和量子模拟在多达100000个量子比特的大规模系统中的前景。这些量子比特由存储在光学晶格的各个晶格位置上的单个原子表示。这种原子的量子注册是通过使用原子玻色-爱因斯坦凝聚体的莫特绝缘体跃迁来形成的。我们计划研究这种量子寄存器的初始化，并将努力进一步增强现有的实验技术，以检测和减少这种量子寄存器的缺陷。我们将使用受控相干碰撞，正如我们的团队首次演示的那样，创建一维和二维团簇态，并研究它们的寿命和退相干性质。此外，我们正计划研究新的、更稳健的光学晶格中超冷原子的纠缠方案，这是基于我们团队最近才展示的晶格中相干碰撞的自旋变化碰撞。基于这些门，我们将尝试提高和研究只作用于两个原子之间的单个碰撞量子门的保真度，然后将这些门操作应用于更大的一维和二维囚禁原子阵列。

We use a top-down approach to investigate the prospects for quantum information and quantum simulations in large scale systems consisting of up to 100000 qubits. These qubits are represented by single atoms stored on individual lattice sites of an optical lattice. Such a quantum register of the atoms is formed by employing the Mott insulator transition from an atomic Bose-Einstein condensate. We plan to investigate the initialization of such a quantum register and will try to further enhance present experimental techniques to detect and minimize defects of such a quantum register. We will use controlled coherent collisions, as first demonstrated by our group, to create 1D and 2D cluster states and investigate their lifetime and decoherence properties. Furthermore, we are planning to investigate novel, more robust entanglement schemes for ultracold atoms in optical lattices, which are based on coherent collisional spin changing collisions in lattices, only recently demonstrated by our group. Based on these gates, we will try to enhance and study the fidelity of individual collisional quantum gates acting between two atoms only and then apply these gate operations to larger 1D and 2D arrays of trapped atoms.