利用声表面波实现量子线中电子的量子隐形传态
Quantum teleportation of electrons in quantum wires with surface acoustic waves
摘要：
提出并数值模拟了一种基于耦合量子线的半导体器件，该器件适用于表面声波极小值中电子的确定性量子隐形传态.我们利用相互作用的半导体量子线网络能够为量子信息处理提供通用的门集合，量子比特由两个耦合通道中的一个中的单个电子的局域化定义。数值方法基于三粒子薛定谔方程的时间依赖解。首先，通过不同沟道中载流子之间的库仑相互作用获得最大纠缠电子对。然后，一个完整的贝尔态测量涉及一个电子从这对和第三个电子进行。最后，通过局域单量子比特操作重建了隐形传态。大的估计保真度明确表明，一个有效的隐形传态过程中可以达到的实验设置。
英文摘要：
We propose and numerically simulate a semiconductor device based on coupled quantum wires, suitable for deterministic quantum teleportation of electrons trapped in the minima of surface acoustic waves.We exploit a network of interacting semiconductor quantum wires able to provide the universal set of gates for quantum information processing, with the qubit defined by the localization of a single electron in one of two coupled channels.The numerical approach is based on a time-dependent solution of the three-particle Schrödinger equation. First, a maximally entangled pair of electrons is obtained via Coulomb interaction between carriers in different channels. Then, a complete Bell-state measurement involving one electron from this pair and a third electron is performed. Finally, the teleported state is reconstructed by means of local one-qubit operations. The large estimated fidelity explicitely suggests that an efficient teleportation process could be reached in an experimental setup.
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