标题： 通过光学费什巴赫共振控制${}^{171}$Yb 中的核自旋交换 显示英文标题

标题： Controlling nuclear spin exchange via optical Feshbach resonances in ${}^{171}$Yb

摘要： 核自旋交换在费米子碱土金属类原子的超冷碰撞中发生，这是由于s波和p波相移之间的差异。 我们研究了在${}^1S_0 \to {}^3P_1$间断线上的光学费什巴赫共振，激发于${}^{171}$Yb，以影响s波散射相移的大幅修改，从而光学介导核交换力。 我们对光缔合共振和波函数进行了完整的多通道计算，并从这些计算中得出散射长度的实部和虚部。 作为这种相互作用的指标，我们估计了在光学晶格中同一势阱中捕获的两个原子实现$\sqrt{SWAP}$纠缠量子逻辑门的保真度。 对于中等参数，可以在$\sim 50 \mu$秒的时间内达到$\sim95% $的门保真度。 显示英文摘要

摘要： Nuclear spin exchange occurs in ultracold collisions of fermionic alkaline-earth-like atoms due to a difference between s- and p-wave phase shifts. We study the use of an optical Feshbach resonance, excited on the ${}^1S_0 \to {}^3P_1$ intercombination line of ${}^{171}$Yb, to affect a large modification of the s-wave scattering phase shift, and thereby optically mediate nuclear exchange forces. We perform a full multichannel calculation of the photoassociation resonances and wave functions and from these calculate the real and imaginary parts of the scattering length. As a figure of merit of this interaction, we estimate the fidelity to implement a $\sqrt{SWAP}$ entangling quantum logic gate for two atoms trapped in the same well of an optical lattice. For moderate parameters one can achieve a gate fidelity of $\sim95% $ in a time of $\sim 50 \mu$s.