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arXiv 1609.09504quant-ph
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用Bloch振荡量子行走直接探测拓扑不变量

Direct Probe of Topological Invariants Using Bloch Oscillating Quantum Walks

Vinay V. Ramasesh, Emmanuel Flurin, Mark S. Rudner, Irfan Siddiqi, Norman Y. Yao

摘要:

单粒子能带结构的拓扑结构在理解许多物理现象中起着基础作用。受量子行走和这种拓扑能带结构之间的联系的启发,我们证明了一个简单的依赖于时间的布洛赫振荡量子行走,使拓扑不变量的直接测量。我们考虑了两类一维量子行走,并将行走器上的全局相位与其重聚焦行为联系起来。通过解开对该阶段的动力学和几何贡献,我们描述了一种测量这些量子漫步中拓扑不变量的一般策略。作为一个例子,我们提出了一个实验方案,在电路QED架构中,超导transmon量子比特扮演硬币的角色,而量子行走发生在相空间的腔。

英文摘要:

The topology of a single-particle band structure plays a fundamental role in understanding a multitude of physical phenomena. Motivated by the connection between quantum walks and such topological band structures, we demonstrate that a simple time-dependent, Bloch-oscillating quantum walk enables the direct measurement of topological invariants. We consider two classes of one-dimensional quantum walks and connect the global phase imprinted on the walker with its refocusing behavior. By disentangling the dynamical and geometric contributions to this phase we describe a general strategy to measure the topological invariant in these quantum walks. As an example, we propose an experimental protocol in a circuit QED architecture where a superconducting transmon qubit plays the role of the coin, while the quantum walk takes place in the phase space of a cavity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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