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arXiv 1004.4377cond-mat.mes-hall
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碳纳米管双量子点探测单自旋

Single Spin Detection with a Carbon Nanotube Double Quantum Dot

S. J. Chorley, G. Giavaras, J. Wabnig, G. A. C. Jones, C. G. Smith, G. A. D. Briggs, M. R. Buitelaar

摘要:

碳纳米管量子点中的自旋量子位由于其具有较长的电子自旋相干时间而在量子信息的编码和处理中具有重要的意义。然而,在碳纳米管可以在量子信息处理方案中找到应用之前,我们需要理解和控制单个电子自旋之间的耦合以及电子自旋与其环境之间的相互作用。在这里,我们利用自旋选择规则来直接测量-并演示控制-两个碳纳米管量子点之间的单重态-三重态交换耦合。我们进一步阐明了自旋轨道相互作用对电子跃迁的影响,并研究了量子点系统与单个杂质自旋的相互作用-自旋灵敏度的极限。

英文摘要:

Spin qubits defined in carbon nanotube quantum dots are of considerable interest for encoding and manipulating quantum information because of the long electron spin coherence times expected. However, before carbon nanotubes can find applications in quantum information processing schemes, we need to understand and control the coupling between individual electron spins and the interaction between the electron spins and their environment. Here we make use of spin selection rules to directly measure - and demonstrate control of - the singlet-triplet exchange coupling between two carbon nanotube quantum dots. We furthermore elucidate the effects of spin-orbit interaction on the electron transitions and investigate the interaction of the quantum dot system with a single impurity spin - the ultimate limit in spin sensitivity.

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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