Department of Physics, University of California, Santa Barbara, California 93106-9530, USA.
1] Department of Physics, University of California, Santa Barbara, California 93106-9530, USA [2] California NanoSystems Institute, University of California, Santa Barbara, California 93106-6105, USA.
Nat Commun. 2014 Oct 14;5:5184. doi: 10.1038/ncomms6184.
Quantum interference is one of the most fundamental physical effects found in nature. Recent advances in quantum computing now employ interference as a fundamental resource for computation and control. Quantum interference also lies at the heart of sophisticated condensed matter phenomena such as Anderson localization, phenomena that are difficult to reproduce in numerical simulations. Here, employing a multiple-element superconducting quantum circuit, with which we manipulate a single microwave photon, we demonstrate that we can emulate the basic effects of weak localization. By engineering the control sequence, we are able to reproduce the well-known negative magnetoresistance of weak localization as well as its temperature dependence. Furthermore, we can use our circuit to continuously tune the level of disorder, a parameter that is not readily accessible in mesoscopic systems. Demonstrating a high level of control, our experiment shows the potential for employing superconducting quantum circuits as emulators for complex quantum phenomena.
量子干涉是自然界中最基本的物理效应之一。最近，量子计算的发展利用干涉作为计算和控制的基本资源。量子干涉也是复杂凝聚态现象的核心，如安德森局域化，这些现象在数值模拟中很难重现。在这里，我们采用了一种多元件超导量子电路，通过它我们可以操纵单个微波光子，证明了我们可以模拟弱局域化的基本效应。通过设计控制序列，我们能够重现弱局域化的著名负磁阻效应及其温度依赖性。此外，我们还可以使用我们的电路连续调节无序程度，这是介观系统中不容易获得的参数。我们的实验展示了高度的控制能力，表明超导量子电路有潜力作为复杂量子现象的模拟器。
