论文标题
在刺激的拉曼转变中，光子散射错误
Photon scattering errors during stimulated Raman transitions in trapped-ion qubits
论文作者
论文摘要
我们研究刺激的拉曼驱动量子逻辑门中的光子散射误差。对于某些参数制度，我们发现该过程的先前简化模型显着高估了由于光子散射引起的栅极错误率。该高估显示是由于以前的模型忽略了散射光子频率和羔羊dicke参数的引起依赖性，第二个散射过程，对散射速率对可稳定歧管的干扰影响以及对拉曼过渡速率的反旋转贡献。所得改进的模型表明，当拉曼激光束从主要的光学转变中变成红色时，由于光子基态矩阵的光子散射没有基本限制。此外，研究了在亚稳态$ d_ {5/2} $歧管中编码的量子的光子散射错误，显示出所有常用的捕获离子的门错误均低于$ 10^{ - 4} $。
We study photon scattering errors in stimulated Raman driven quantum logic gates. For certain parameter regimes, we find that previous, simplified models of the process significantly overestimate the gate error rate due to photon scattering. This overestimate is shown to be due to previous models neglecting the detuning dependence of the scattered photon frequency and Lamb-Dicke parameter, a second scattering process, interference effects on scattering rates to metastable manifolds, and the counter-rotating contribution to the Raman transition rate. The resulting improved model shows that there is no fundamental limit on gate error due to photon scattering for electronic ground state qubits in commonly-used trapped-ion species when the Raman laser beams are red detuned from the main optical transition. Additionally, photon scattering errors are studied for qubits encoded in metastable $D_{5/2}$ manifold, showing that gate errors below $10^{-4}$ are achievable for all commonly-used trapped ions.
