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arXiv 1302.6759cond-mat.mes-hallquant-ph
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量子点中单自旋态的电压可调谐性

Voltage tunability of single spin-states in a quantum dot

Anthony J. Bennett, Matthew A. Pooley, Yameng Cao, Niklas Sköld, Ian Farrer, David A. Ritchie, Andrew J. Shields

摘要:

固态中的单自旋提供了存储和操纵量子信息以及执行局部场和电荷的量子增强感测的独特机会。利用原子物理学发展起来的技术对这些系统进行光学控制,还需要充分利用固态的所有优点。我们通过改变自旋如何感知磁场,证明了单个量子点中自旋能级的电压可调谐性。我们发现,随着更多的空穴加载到点上,平面内的g因子不连续地变化。相反,面内孔g因子连续变化。该器件可以改变单个空穴的面内g因子的符号,在这一点上,在两个自旋本征态中观察到避免的交叉。这正是用一个电子门来控制单个自旋所需要的。

英文摘要:

Single spins in the solid-state offer a unique opportunity to store and manipulate quantum information, and to perform quantum-enhanced sensing of local fields and charges. Optical control of these systems using techniques developed in atomic physics has yet to exploit all the advantages of the solid-state. We demonstrate voltage tunability of the spin energy levels in a single quantum dot by modifying how spins sense magnetic field. We find the in-plane g-factor varies discontinuously for electrons, as more holes are loaded onto the dot. In contrast, the in-plane hole g-factor varies continuously. The device can change the sign of the in-plane g-factor of a single hole, at which point an avoided crossing is observed in the two spin eigenstates. This is exactly what is required for universal control of a single spin with a single electrical gate.

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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