Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, D-53115 Bonn, Germany.
Phys Rev Lett. 2013 May 10;110(19):190601. doi: 10.1103/PhysRevLett.110.190601. Epub 2013 May 7.
We report on the experimental realization of electric quantum walks, which mimic the effect of an electric field on a charged particle in a lattice. Starting from a textbook implementation of discrete-time quantum walks, we introduce an extra operation in each step to implement the effect of the field. The recorded dynamics of such a quantum particle exhibits features closely related to Bloch oscillations and interband tunneling. In particular, we explore the regime of strong fields, demonstrating contrasting quantum behaviors: quantum resonances versus dynamical localization depending on whether the accumulated Bloch phase is a rational or irrational fraction of 2π.
我们报告了电量子漫步的实验实现，它模拟了晶格中电场对带电粒子的作用。从离散时间量子漫步的教科书实现开始，我们在每个步骤中引入一个额外的操作来实现场的效果。这种量子粒子的记录动力学表现出与布洛赫振荡和能带间隧道密切相关的特征。特别是，我们探索了强场的范围，展示了对比鲜明的量子行为：量子共振与动态局域化取决于积累的布洛赫相位是 2π 的有理数还是无理数。
