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arXiv 1302.4033cond-mat.mes-hall
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Majorana束缚态的微波耦合

Microwave-controlled coupling of Majorana bound states

Thomas L. Schmidt, Andreas Nunnenkamp, Christoph Bruder

摘要:

我们提出了微波控制的量子比特实现马约拉纳束缚态的旋转。为此,我们研究了微波腔中的非均匀Kitaev链。该链由两个拓扑非平凡区域组成,它们被一个拓扑平凡的间隙区域分隔开。在左(右)区和中央区之间的界面处的Majorana束缚态是耦合的,并且它们的能量通过虚共隧穿过程而分裂。这些cotunneling过程的振幅呈指数下降的网站的缺口区域的数量,和衰减长度发散的拓扑平凡的区域关闭的间隙。我们证明,微波辐射可以指数增强马约拉纳束缚态之间的耦合,无论是经典的和量子化的电场。通过数值求解适当的刘维尔方程,我们表明,微波可以驱动拉比振荡的马约拉纳部门。我们的模型出现作为一个有效的描述拓扑半导体纳米线在微波腔。因此,我们的建议提供了一种实验上可行的方法来获得完整的单量子位控制所需的通用量子计算与马约拉纳量子位。

英文摘要:

We propose microwave-controlled rotations for qubits realized as Majorana bound states. To this end we study an inhomogeneous Kitaev chain in a microwave cavity. The chain consists of two topologically nontrivial regions separated by a topologically trivial, gapped region. The Majorana bound states at the interfaces between the left (right) regions and the central region are coupled, and their energies are split by virtual cotunneling processes. The amplitude for these cotunneling processes decreases exponentially in the number of sites of the gapped region, and the decay length diverges as the gap of the topologically trivial region closes. We demonstrate that microwave radiation can exponentially enhance the coupling between the Majorana bound states, both for classical and quantized electric fields. By solving the appropriate Liouville equation numerically we show that microwaves can drive Rabi oscillations in the Majorana sector. Our model emerges as an effective description for a topological semiconductor nanowire in a microwave cavity. Thus, our proposal provides an experimentally feasible way to obtain full single-qubit control necessary for universal quantum computation with Majorana qubits.

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