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arXiv 1105.0263cond-mat.mes-hallcond-mat.supr-con
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四约瑟夫森结电路激发态能级在双阱到单阱跃迁中的可调谐性

Tunability of Excited-State Energy Levels of Four-Josephson-Junction Circuit in Crossover from Double-Well to Single-Well Potential

Yoshihiro Shimazu

摘要:

双环四约瑟夫森结(4-JJ)通量量子位是可调谐量子位,其中电势分布可以经由两个施加的磁通量原位变化。这提供了对状态转换的高级别控制。在这里,我们报告这个系统上的光谱测量的结果。我们观察到与第一和第二激发态相关的微波共振。还观察到最可能归因于第三激发态的共振分支。这些能级的激发能谱与使用两相有效哈密顿量进行的简化计算的结果定性一致。在这项研究中的三个最低水平的特点可能会允许新的应用程序,包括那些在理论上提出了过去。我们的分析表明,潜在的表现出交叉从常用的双阱制度的新颖的单阱制度。这表明了使用简单技术在单阱机制中操纵和读出3-JJ(和4-JJ)量子位的可能性。

英文摘要:

A double-loop four-Josephson-junction (4-JJ) flux qubit is a tunable qubit wherein the potential profile can be varied in situ via two applied magnetic fluxes. This provides a high level of control over state transitions. Here, we report the results of spectroscopic measurements on this system. We observed microwave resonances associated with the first and second excited states. A branch of resonances that is most likely attributable to the third excited state was also observed. The excitation energy spectra for these levels were in qualitative agreement with the results of simplified calculations performed using an effective Hamiltonian with two phases. The three lowest levels characterized in this study may allow novel applications, including those proposed theoretically in the past. Our analysis showed that the potential exhibited a crossover from the commonly used double-well regime to the novel single-well regime. This indicates the possibility of manipulation and readout of a 3-JJ (and 4-JJ) qubit in the single-well regime using a simple technique.

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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