论文标题
中性rydberg原子的弱范德华相互作用的量子门
Quantum gates with weak van der Waals interactions of neutral Rydberg atoms
论文作者
论文摘要
中性原子对于大规模量子计算有希望，但是准确的中性原子纠缠取决于大型的rydberg相互作用，这些相互作用强烈限制了原子间距离。通过与Rydberg Rabi频率相似的rydberg相互作用来实现的兔循环中的相位积累，我们研究了具有任意阶段的受控相位栅极，并将其扩展到受控的闸门。门只需要三个步骤即可耦合一个rydberg状态，依赖于易于访问的范德华的相互作用，而范德华的相互作用自然在遥远的原子之间出现，并且在弱相互作用方程中没有旋转误差。重要的是，它们可以进行非常弱的互动工作，以便可以纠缠良好的Qubits。大门对Rydberg相互作用的不可忽视的波动很敏感，但仍然可以在98 \％以上的忠诚度，而实际的位置波动在20〜 $ $ m上分开。
Neutral atoms are promising for large-scale quantum computing, but accurate neutral-atom entanglement depends on large Rydberg interactions which strongly limit the interatomic distances. Via a phase accumulation in detuned Rabi cycles enabled by a Rydberg interaction of similar magnitude to the Rydberg Rabi frequency, we study a controlled-phase gate with an arbitrary phase and extend it to the controlled-NOT gate. The gates need only three steps for coupling one Rydberg state, depend on easily accessible van der Waals interaction that naturally arises between distant atoms, and have no rotation error in the weak interaction regime. Importantly, they can work with very weak interactions so that well-separated qubits can be entangled. The gates are sensitive to the irremovable fluctuation of Rydberg interactions, but can still have a fidelity over 98\% with realistic position fluctuation of qubits separated over 20~$μ$m.
