Improving the lifetime of the nitrogen-vacancy-center ensemble coupled with a superconducting flux qubit by applying magnetic fields
Improving the lifetime of the nitrogen-vacancy-center ensemble coupled with a superconducting flux qubit by applying magnetic fields
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DOI：
10.1103/physreva.91.042329
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发表时间：
2015-03
影响因子：
2.9
通讯作者：
Y. Matsuzaki;Xiaobo Zhu;K. Kakuyanagi;H. Toida;T. Shimooka;N. Mizuochi;K. Nemoto;K. Semba;W. J. Munro;H. Yamaguchi;S. Saito
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文献类型：
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作者：
Y. Matsuzaki;Xiaobo Zhu;K. Kakuyanagi;H. Toida;T. Shimooka;N. Mizuochi;K. Nemoto;K. Semba;W. J. Munro;H. Yamaguchi;S. Saito
实现量子计算的一个很有前途的系统是一种混合系统，其中超导通量量子比特扮演量子处理器的角色，氮空位- $({\ mathm {NV}}^{\ensuremath{-}})$中心系集合作为量子存储器。我们从理论上和实验上研究了磁场对该混合系统的影响，发现在${\ mathm {NV}}^{\ensuremath{-}}$中心系综上施加少量mT的磁场可以提高真空拉比振荡的寿命。在此，我们构建了一个理论模型来重现有磁场和没有磁场作用于${\ mathm {NV}}^{\ensuremath{-}}$中心的真空拉比振荡，并确定了磁场影响${\ mathm {NV}}}^{\ensuremath{-}}$中心系综相干特性的原因。通过理论分析，我们定量地证明了磁场实际上抑制了${\ mathm {NV}}^{\ensuremath{-}}$中心应变的非均匀展宽。
One of the promising systems to realize quantum computation is a hybrid system where a superconducting flux qubit plays the role of a quantum processor and the nitrogen-vacancy- $({\mathrm{NV}}^{\ensuremath{-}})$ center ensemble is used as a quantum memory. We have theoretically and experimentally studied the effect of magnetic fields on this hybrid system, and found that the lifetime of the vacuum Rabi oscillation is improved by applying a few mT magnetic field to the ${\mathrm{NV}}^{\ensuremath{-}}$ center ensemble. Here, we construct a theoretical model to reproduce the vacuum Rabi oscillations with and without magnetic fields applied to the ${\mathrm{NV}}^{\ensuremath{-}}$ centers, and we determine the reason why magnetic fields can affect the coherent properties of the ${\mathrm{NV}}^{\ensuremath{-}}$ center ensemble. From our theoretical analysis, we quantitatively show that the magnetic fields actually suppress the inhomogeneous broadening from the strain in the ${\mathrm{NV}}^{\ensuremath{-}}$ centers.