相干喇曼再抽运和双色喇曼转移的状态探测
State detection using coherent Raman repumping and two-color Raman transfers
摘要：
我们演示了基于相干拉曼再泵浦和双色拉曼态转移的状态检测。在检测期间的拉曼耦合选择性地消除荧光循环中的不想要的暗态，而不损害期望的暗态对非共振散射的免疫性。我们使用$^{137}\mathrm{Ba}^+$证明了这种技术，其中拉曼耦合和光泵浦的组合使$D_{3/2}$ $\ket{F"=3,m_F"=3}$亚稳态光学暗且不受非共振散射的影响。所有其他状态都与高$P_{1/2}$能级强耦合。我们实现了Single Shot状态检测效率的$89.6(3)%$在$1\mathrm{ms}$集成时间，几乎完全由技术缺陷的限制。在检测之前搁置到$\ket{F"=3,m_F"=3}$状态经由具有$1.00(3)$保真度的双色拉曼转移来执行。
英文摘要：
We demonstrate state detection based on coherent Raman repumping and a two-color Raman state transfer. The Raman coupling during detection selectively eliminates unwanted dark states in the fluorescence cycle without compromising the immunity of the desired dark state to off-resonant scattering. We demonstrate this technique using $^{137}\mathrm{Ba}^+$ where a combination of Raman coupling and optical pumping leaves the $D_{3/2}$ $\ket{F"=3,m_F"=3}$ metastable state optically dark and immune to off-resonant scattering. All other states are strongly coupled to the upper $P_{1/2}$ levels. We achieve a single shot state-detection efficiency of $89.6(3)%$ in a $1\mathrm{ms}$ integration time, limited almost entirely by technical imperfections. Shelving to the $\ket{F"=3,m_F"=3}$ state before detection is performed via a two-color Raman transfer with a fidelity of $1.00(3)$.
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