Low Temperature Laboratory, Aalto University, Finland.
Phys Rev Lett. 2011 Nov 11;107(20):207002. doi: 10.1103/PhysRevLett.107.207002.
We propose a new type of interferometry, based on geometric phases accumulated by a periodically driven two-level system undergoing multiple Landau-Zener transitions. As a specific example, we study its implementation in a superconducting charge pump. We find that interference patterns appear as a function of the pumping frequency and the phase bias, and clearly manifest themselves in the pumped charge. We also show that the effects described should persist in the presence of realistic decoherence.
我们提出了一种新型的干涉测量法，基于周期性驱动的经历多次朗道-泽纳跃迁的两能级系统积累的几何相位。作为一个具体的例子，我们研究了它在超导电荷泵中的实现。我们发现，干涉图案作为泵送频率和相位偏置的函数出现，并在泵送电荷中清晰地表现出来。我们还表明，在存在实际退相干的情况下，所描述的效应应该仍然存在。
