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arXiv 0911.4818cond-mat.str-el
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轴对称晶场中稀土金属离子的自旋轨道量子比特

Spin-Orbit Qubits of Rare-Earth-Metal Ions in Axially Symmetric Crystal Fields

Sylvain Bertaina, J. H. Shim, S. Gambarelli, B. Z. Malkin, B. Barbara

摘要:

与众所周知的自旋量子比特相反,稀土量子比特的特征在于由于大的自旋轨道耦合而引起的强烈的晶体场影响。在低温和存在共振微波的情况下,是晶场基态的磁矩章动(对于几个$μ$),并且拉比频率$Ω_R$是各向异性的。在这里,我们提出了一个研究的变化$Ω_R(\vec{H}_{0})$与静态磁场$\vec{H_{0}}$的大小和方向的奇数$^{167}$ Er同位素在单晶CaWO $_4$:Er $^{3+}$。超精细相互作用将$Ω_R(\vec{H}_{0})$曲线分裂成八条不同的曲线,这些曲线被数值拟合和解析描述。这些“自旋轨道量子比特”应该允许对高温下相关的退相干机制进行详细研究,并为使用适当定向的磁场进行量子比特寻址开辟新途径。

英文摘要:

Contrary to the well known spin qubits, rare-earth qubits are characterized by a strong influence of crystal field due to large spin-orbit coupling. At low temperature and in the presence of resonance microwaves, it is the magnetic moment of the crystal-field ground-state which nutates (for several $μ$s) and the Rabi frequency $Ω_R$ is anisotropic. Here, we present a study of the variations of $Ω_R(\vec{H}_{0})$ with the magnitude and direction of the static magnetic field $\vec{H_{0}}$ for the odd $^{167}$Er isotope in a single crystal CaWO$_4$:Er$^{3+}$. The hyperfine interactions split the $Ω_R(\vec{H}_{0})$ curve into eight different curves which are fitted numerically and described analytically. These "spin-orbit qubits" should allow detailed studies of decoherence mechanisms which become relevant at high temperature and open new ways for qubit addressing using properly oriented magnetic fields.

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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