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arXiv 1012.4545cond-mat.mes-hall
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量子点中原子核自旋的电压选择性双向极化和相干旋转

Voltage-Selective Bi-directional Polarization and Coherent Rotation of Nuclear Spins in Quantum Dots

Ryo Takahashi, Kimitoshi Kono, Seigo Tarucha, Keiji Ono

摘要:

我们提出并证明了GaAs双量子点中主晶格的核自旋可以在两个相反方向中的任何一个方向上被强极化,即平行于或反平行于外磁场。通过调整器件的直流源极-漏极电压,可以简单地选择方向。这种核极化通过在泡利自旋封锁状态下重复控制的电子-核自旋散射来表现。极化核也可通过核磁共振(NMR)进行相干控制。这项工作证实了量子点中的核自旋确实是长寿命的量子态,其相干时间高达1 ms,并且可能是用于量子信息处理的有前途的资源,例如用于电子自旋量子比特的量子存储器。

英文摘要:

We proposed and demonstrated that the nuclear spins of the host lattice in GaAs double quantum dots can be strongly polarized in either of two opposite directions, parallel or antiparallel to an external magnetic field. The direction is selected simply by adjusting the dc source-drain voltage of the device. This nuclear polarization manifests itself by repeated controlled electron-nuclear spin scattering in the Pauli spin blockade state. Polarized nuclei are also controlled coherently by means of nuclear magnetic resonance (NMR). This work confirmed that the nuclear spins in quantum dots are indeed long-lived quantum states with a coherence time of up to 1 ms, and may be a promising resource for quantum information processing such as quantum memories for electron spin qubits.

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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