论文标题
动态脱钩的单中性原子的连贯性
Coherence of a dynamically decoupled single neutral atom
论文作者
论文摘要
长量子的连贯性和有效的原子 - 光子耦合对于量子通信中的高级应用至关重要。维持连贯性的一种技术是动态脱钩，其中采用重新聚焦脉冲的周期性序列来减少系统与环境的相互作用。我们通过实验研究在光学捕获的，自旋偏置的$^{87} $ rb原子上的动态解耦的实现。我们使用两个磁敏感的$ 5S_ {1/2} $ zeeman级别，$ \ lvert {f = 2，\ m_ {f} = - 2} = - 2} \ rangle $和$ \ lvert {f = 1，\ m_ {f} = -1} = -1} \ 1} \ rangle $ as the Mositibles f = f = 2 m_ {f} = -2} \ rangle $ to $ 5p_ {3/2} $激发状态$ \ lvert {f'= 3，\ m'_ {f} = - 3} \ rangle $通过封闭的光学过渡。随着动态解耦技术的更多重新关注脉冲，我们设法将连贯性时间从38（3）$ $ s扩展到两毫秒以上。我们还观察到了原子的运动状态与重新聚焦后的量子相干性之间有很强的相关性，可以用作解决捕获参数的测量基础。
Long qubit coherence and efficient atom-photon coupling are essential for advanced applications in quantum communication. One technique to maintain coherence is dynamical decoupling, where a periodic sequence of refocusing pulses is employed to reduce the interaction of the system with the environment. We experimentally study the implementation of dynamical decoupling on an optically-trapped, spin-polarized $^{87}$Rb atom. We use the two magnetic-sensitive $5S_{1/2}$ Zeeman levels, $\lvert{F=2,\ m_{F}=-2}\rangle$ and $\lvert{F=1,\ m_{F}=-1}\rangle$ as qubit states, motivated by the possibility to couple $\lvert{F=2,\ m_{F}=-2}\rangle$ to $5P_{3/2}$ the excited state $\lvert{F'=3,\ m'_{F}=-3}\rangle$ via a closed optical transition. With more refocusing pulses in the dynamical decoupling technique, we manage to extend the coherence time from 38(3)$μ$s to more than two milliseconds. We also observe a strong correlation between the motional states of the atom and the qubit coherence after the refocusing, which can be used as a measurement basis to resolve trapping parameters.
