Elster Fabian, Barkhofen Sonja, Nitsche Thomas, Novotný Jaroslav, Gábris Aurél, Jex Igor, Silberhorn Christine
Applied Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany.
Department of Physics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 11519 Prague, Czech Republic.
Sci Rep. 2015 Aug 27;5:13495. doi: 10.1038/srep13495.
Coherent evolution governs the behaviour of all quantum systems, but in nature it is often subjected to influence of a classical environment. For analysing quantum transport phenomena quantum walks emerge as suitable model systems. In particular, quantum walks on percolation structures constitute an attractive platform for studying open system dynamics of random media. Here, we present an implementation of quantum walks differing from the previous experiments by achieving dynamical control of the underlying graph structure. We demonstrate the evolution of an optical time-multiplexed quantum walk over six double steps, revealing the intricate interplay between the internal and external degrees of freedom. The observation of clear non-Markovian signatures in the coin space testifies the high coherence of the implementation and the extraordinary degree of control of all system parameters. Our work is the proof-of-principle experiment of a quantum walk on a dynamical percolation graph, paving the way towards complex simulation of quantum transport in random media.
相干演化支配着所有量子系统的行为，但在自然界中，它常常受到经典环境的影响。为了分析量子输运现象，量子行走成为合适的模型系统。特别是，渗流结构上的量子行走构成了研究随机介质开放系统动力学的一个有吸引力的平台。在此，我们展示了一种与之前实验不同的量子行走实现方式，即通过对底层图结构实现动态控制。我们展示了一个光学时分复用量子行走在六个双步上的演化，揭示了内部和外部自由度之间复杂的相互作用。在硬币空间中观察到清晰的非马尔可夫特征，证明了该实现方式的高相干性以及对所有系统参数的非凡控制程度。我们的工作是在动态渗流图上进行量子行走的原理验证实验，为随机介质中量子输运的复杂模拟铺平了道路。
