Title: Two-qubit controlled-PHASE Rydberg blockade gate protocol for neutral atoms via off-resonant modulated driving within a single pulse Show Chinese title

Title: 通过单个脉冲内的非共振调制驱动实现中性原子的两量子比特受控-相位里德伯阻塞门协议

Abstract: Neutral atom array serves as an ideal platform to study the quantum logic gates, where intense efforts have been devoted to enhance the two-qubit gate fidelity. We report our recent findings in constructing theoretically a different type of two-qubit controlled-PHASE quantum gate with neutral atoms enabled by Rydberg blockade, which behaves like the hybrid version of the $\pi$-gap-$\pi$ gate and Rydberg dressing gate. Its principle relies upon smooth modulated pulse with specially tailored waveform to gain appropriate phase accumulations for quantum gates while suppressing population leakage error and rotation error. The major features include finishing gate operation within a single pulse, not necessarily requiring individual site addressing, and not sensitive to the exact value of blockade shift. Therefore, we anticipate its fidelity to be reasonably high under realistic considerations for intrinsic errors. Moreover, we hope that such type of protocol may inspire future improvements in quantum gates for other categories of qubit platforms, and that its core ingredients may be helpful in the field of quantum optimal control. Show Chinese abstract

Abstract: 中性原子阵列为研究量子逻辑门提供了一个理想的平台，其中已经投入了大量努力来提高两量子比特门的保真度。 我们报告了最近在理论上构建一种不同类型的两量子比特受控相位量子门的研究成果，该门通过里德伯阻塞效应由中性原子实现，其表现类似于$\pi$-gap-$\pi$门和里德伯编织门的混合版本。 其原理依赖于平滑调制脉冲，通过特别设计的波形来获得适当的相位积累以实现量子门，同时抑制种群泄漏误差和旋转误差。 主要特点包括在单个脉冲内完成门操作，不一定需要逐个站点寻址，并且对阻塞偏移的确切值不敏感。 因此，我们认为在考虑内在误差的实际情况下，其保真度可能相当高。 此外，我们希望这种类型的协议可能激发其他种类量子比特平台在量子门方面的未来改进，并且其核心要素可能对量子最优控制领域有所帮助。