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arXiv 2012.07132cond-mat.mes-hallcond-mat.supr-con
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Josephson弱链中的自旋相干操纵

Spin Coherent Manipulation in Josephson Weak Links

Javier Cerrillo, Max Hays, Valla Fatemi, Alfredo Levy Yeyati

摘要:

基于半导体纳米线结合电路QED技术的约瑟夫森弱链接的新设计已经能够解决由于自旋轨道相互作用而导致的精细结构,从而打开了通往Andreev自旋量子位的道路。尽管如此,在一个给定的Andreev状态的自旋的直接操纵一般被抑制相比,在塞曼效应的情况下的双重操纵。此外,嘈杂的自旋翻转机制限制了任何相干操纵协议,以自旋后选择。我们提出了一个类似于边带冷却的自旋极化协议与受激拉曼绝热通道专门为这些系统量身定制的组合。我们表明,这种方法是强大的大范围的设计参数,包括目前相当严格的相干时间。

英文摘要:

Novel designs of Josephson weak links based on semiconducting nanowires combined with circuit QED techniques have enabled the resolution of their fine structure due to spin-orbit interactions, opening a path towards Andreev spin qubits. Nevertheless, direct manipulation of the spin within a given Andreev state is in general suppressed compared to inter-doublet manipulation in the absence of Zeeman effects. In addition, noisy spin-flip mechanisms limit any coherent manipulation protocol to spin post-selection. We propose a combination of a spin polarization protocol analogous to sideband cooling with stimulated Raman adiabatic passage specifically tailored for these systems. We show this approach is robust for a large range of design parameters, including the currently rather stringent coherence times.

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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