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Optically controlled locking of the nuclear field via coherent dark-state spectroscopy

机译：通过相干暗态光谱对核场进行光控锁定

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摘要

A single electron or hole spin trapped inside a semiconductor quantum dot forms the foundation for many proposed quantum logic devices. In group III-V materials, the resonance and coherence between two ground states of the single spin are inevitably affected by the lattice nuclear spins through the hyperfine interaction, while the dynamics of the single spin also influence the nuclear environment. Recent efforts12'16 have been made to protect the coherence of spins in quantum dots by suppressing the nuclear spin fluctuations. However, coherent control of a single spin in a single dot with simultaneous suppression of the nuclear fluctuations has yet to be achieved. Here we report the suppression of nuclear field fluctuations in a singly charged quantum dot to well below the thermal value, as shown by an enhancement of the single electron spin dephasing time T_2~*, which we measure using coherent dark-state spectroscopy. The suppression of nuclear fluctuations is found to result from a hole-spin assisted dynamic nuclear spin polarization feedback process, where the stable value of the nuclear field is determined only by the laser frequencies at fixed laser powers. This nuclear field locking is further demonstrated in arnthree-laser measurement, indicating a possible enhancement of the electron spin T_2~* by a factor of several hundred. This is a simple and powerful method of enhancing the electron spin coherence time without use of 'spin echo'-type techniques. We expect that our results will enable the reproducible preparation of the nuclear spin environment for repetitive control and measurement of a single spin with minimal statistical broadening.
机译：陷在半导体量子点内的单个电子或空穴自旋形成了许多拟议的量子逻辑器件的基础。在III-V族材料中，单旋的两个基态之间的共振和相干性不可避免地受到超精细相互作用的晶格核自旋的影响，而单旋的动力学也影响着核环境。为了抑制量子点的自旋相干性，最近做出了一些努力[12，16]。然而，尚未实现对单个点中的单个自旋的相干控制以及同时抑制核波动的控制。在这里，我们报道了单电荷自旋量子点中核场波动的抑制作用，该抑制作用远低于热值，这表现为单电子自旋移相时间T_2〜*的增加，我们使用相干暗态光谱法对其进行了测量。发现核波动的抑制是由空穴自旋辅助的动态核自旋极化反馈过程引起的，其中核场的稳定值仅由固定激光功率下的激光频率确定。在原子激光测量中进一步证明了这种核场锁定，表明电子自旋T_2〜*可能增强了数百倍。这是一种无需使用“自旋回波”型技术即可提高电子自旋相干时间的简单有效的方法。我们希望我们的结果将能够以最小的统计范围扩展为重复控制和测量单个自旋提供可重复的核自旋环境制备。

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  • 来源
    《Nature》 |2009年第25期|1105-1109|共5页
  • 作者

    Xiaodong Xu; Wang Yao; Bo Sun; Duncan G. Steel; Allan S. Bracker; Daniel Gammon; L. J. Sham;

  • 作者单位

    The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA These authors contributed equally to this work;

    Department of Physics, The University of Hong Kong, Hong Kong, China These authors contributed equally to this work;

    The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA These authors contributed equally to this work;

    The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA;

    Naval Research Laboratory, Washington DC 20375, USA;

    Naval Research Laboratory, Washington DC 20375, USA;

    Department of Physics, University of California San Diego, La Jolla, California 92093, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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