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arXiv 1303.7019cond-mat.mes-hallquant-ph
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超导量子比特中的局域几何相位和量子态层析

Local Geometric Phase and Quantum State Tomography in a Superconducting Qubit

Kicheon Kang

摘要:

我们研究了Aharonov-Bohm磁通穿过的超导量子比特的量子态重构,特别关注局部几何相位。介绍了一种状态重建方案,适当考虑了法拉第感应定律产生的局部几何相位。我们的方案是基于三个互补量的测量,即额外的电荷和两个本地电流。通过对时间反演对称性和法拉第定律的解释,我们证明了在规范的选择上,完全的密度矩阵可以被无歧义地重建。这个过程清楚地表明,量子法拉第效应在涉及Aharonov-Bohm通量的量子系统的动力学中起着至关重要的作用。

英文摘要:

We investigate quantum state reconstruction of a superconducting qubit threaded by an Aharonov-Bohm flux, with particular attention to the local geometric phase. A state reconstruction scheme is introduced with a proper account of the local geometric phase generated by Faraday's law of induction. Our scheme is based on measurement of three complementary quantities, that is, the extra charge and two local currents. Incorporating time-reversal symmetry and the Faraday's law, we show that the full density matrix can be reconstructed without ambiguity in the choice of gauge. This procedure clearly demonstrates that the quantum Faraday effect plays an essential role in the dynamics of a quantum system that involves Aharonov-Bohm flux.

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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