基于无能级交叉回波快速绝热通道的里德伯原子鲁棒受控-Z门
Robust controlled-Z gate for Rydberg atoms based on level-crossing-free echoing rapid adiabatic passage
AI总结：
该研究提出一种基于无能级交叉回波快速绝热通道的里德伯原子鲁棒受控-Z门方案，通过特定脉冲设计与耗散建模，实现高保真度的两/三量子比特门，抗参数波动能力强，适用于大规模中性原子阵列并行操作。
AI中文摘要：
我们提出了一种基于无能级交叉回波快速绝热布居转移的里德伯原子受控-Z门方案。设计了反对称拉比频率脉冲与对称失谐脉冲，使系统在整个演化过程中完全避开能级交叉点，且双脉冲序列的时间反演对称性可自然消除动力学相位。通过林德布拉德主方程纳入耗散效应，数值模拟得到两量子比特CZ门保真度为0.9999；当拉比频率波动在±2%以内、失谐偏移在±1%以内时，保真度仍可保持在0.999以上。在相同耗散模型下，三量子比特CCZ门保真度达到0.999，当单参数波动不超过±3%时，保真度始终高于0.997。该方案无需激光相位跳变或快速开关操作，零面积脉冲结构可抑制一阶强度噪声，对称双脉冲序列避免了空间分辨的激光开关，适合大规模中性原子阵列中的并行门操作。
英文摘要：
We propose a controlled-Z gate scheme for Rydberg atoms based on level-crossing-free echoing rapid adiabatic population transfer. We design antisymmetric Rabi frequency pulses and symmetric detuning pulses, enabling the system to completely avoid level-crossing points throughout the evolution, and the dynamical phase is naturally eliminated by the time-reversal symmetry of the double-pulse sequence. We incorporate dissipative effects through the Lindblad master equation. The numerical simulation yields a two-qubit CZ gate fidelity of 0.9999. When the Rabi-frequency fluctuation is within $\pm 2\%$, and the detuning offset is within $\pm 1\%$, the fidelity can still remain above 0.999. Under the same dissipative model, the three-qubit CCZ gate achieves a fidelity of 0.999. When a single-parameter fluctuation does not exceed $\pm 3\%$, the fidelity is always higher than 0.997. Our scheme requires no laser phase jumps or fast switching operations. The zero-area pulse structure suppresses first-order intensity noise, and the symmetric double-pulse sequence avoids spatially resolved laser switching, making it suitable for parallel gate operations in large-scale neutral-atom arrays.
