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arXiv 0901.0881quant-ph
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线性离子阱制备二维团簇态

Two-dimensional cluster-state preparation with linear ion traps

Harald Wunderlich, Christof Wunderlich, Kilian Singer, Ferdinand Schmidt-Kaler

摘要:

我们提出了制备二维团簇态的方案[H. J. Briegel和R. Raussendorf,Phys. Rev. Lett. { \bf 86},910(2001)],其中原子离子被限制在微结构线性离子阱中并通过工程自旋-自旋相互作用耦合。特别是,我们展示了如何准备一个$n \times 2$集群状态通过创建一个线性集群状态,并添加第三邻居纠缠使用选择性再耦合技术。该计划是基于分段线性保罗陷阱提供的能力,以限制在本地势阱离子和这些井之间的分离和运输离子。此外,我们考虑通过设计耦合矩阵来创建3和4量子比特的团簇状态,使得通过时间演化的周期性来消除不需要的耦合。所有的缠绕操作都是通过切换电压和电流来实现的,并且不需要与激光相互作用。

英文摘要:

We present schemes to prepare two-dimensional cluster states [H. J. Briegel and R. Raussendorf, Phys. Rev. Lett. {\bf 86}, 910 (2001)] with atomic ions confined in a micro-structured linear ion trap and coupled by an engineered spin-spin interaction. In particular, we show how to prepare a $n \times 2$ cluster state by creating a linear cluster state and adding third-neighbor entanglement using selective recoupling techniques. The scheme is based on the capabilities provided by segmented linear Paul traps to confine ions in local potential wells and to separate and transport ions between these wells. Furthermore, we consider creating 3 and 4-qubit cluster states by engineering the coupling matrix such that through the periodicity of the time evolution unwanted couplings are canceled. All entangling operations are achieved by switching of voltages and currents, and do not require interaction with laser light.

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