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 improve the two-qubit gate fidelity. We report our recent findings in constructing a different type of two-qubit controlled-PHASE quantum gate protocol with neutral atoms enabled by Rydberg blockade, which aims at both robustness and high-fidelity. It relies upon modulated driving pulse with specially tailored smooth waveform to gain appropriate phase accumulations for quantum gates. The major features include finishing gate operation within a single pulse, not necessarily requiring individual site addressing, not sensitive to the exact value of blockade shift while suppressing population leakage error and rotation error. We anticipate its fidelity to be reasonably high under realistic considerations for errors such as atomic motion, laser power fluctuation, power imbalance, spontaneous emission and so on. Moreover, we hope that such type of protocol may inspire future improvements in quantum gate designs for other categories of qubit platforms and new applications in other areas of quantum optimal control. Show Chinese abstract

Abstract: 中性原子阵列作为研究量子逻辑门的理想平台，已有大量努力致力于提高两量子比特门的保真度。 我们报告了最近在构建一种由里德伯阻塞实现的新型两量子比特受控相位量子门协议的研究成果，该协议旨在兼顾鲁棒性和高保真度。 它依赖于经过调制的驱动脉冲，具有特别设计的平滑波形，以获得量子门所需的适当相位积累。 主要特点包括在单个脉冲内完成门操作，不一定需要单独的站点地址，对阻塞偏移的确切值不敏感，同时抑制了种群泄漏误差和旋转误差。 我们预计在考虑原子运动、激光功率波动、功率不平衡、自发辐射等现实误差的情况下，其保真度将合理较高。 此外，我们希望这种类型的协议可能启发未来在其他类别量子比特平台上的量子门设计改进以及在量子最优控制其他领域的新的应用。