论文标题
中性原子两倍大门的强大控制和最佳rydberg状态
Robust control and optimal Rydberg states for neutral atom two-qubit gates
论文作者
论文摘要
我们利用Rydberg州的中性原子平台上研究了两分门对实验对照偏差的鲁棒性。我们构建了强大的CZ大门 - 采用量子最佳控制的技术 - 在存在与Rydberg State的耦合强度的明显偏差的情况下，保留了高钟状忠诚$ f> 0.999 $。这种偏差可能是由于激光强度噪声和不均匀耦合场中的原子运动引起的。我们还讨论了由于激光失调的偏差而减轻错误的方法。与自发发射和黑体辐射设定的基本衰减时间尺度相比，设计的脉冲在时间尺度上工作。我们在优化和忠诚度计算中考虑了Rydberg状态的有限寿命 - 这使得门有利于嘈杂的中间规模量子实验，这意味着我们的协议可以减少对近期量子计算设备的不忠。我们计算与锶88原子不忠有关的物理特性 - 包括生命，极化能力和阻断强度 - 并使用这些计算来确定我们的方案的最佳Rydberg状态，从而可以进一步最小化不忠。
We investigate the robustness of two-qubit gates to deviations of experimental controls, on a neutral atom platform utilizing Rydberg states. We construct robust CZ gates - employing techniques from quantum optimal control - that retain high Bell state fidelity $F > 0.999$ in the presence of significant deviations of the coupling strength to the Rydberg state. Such deviations can arise from laser intensity noise and atomic motion in an inhomogeneous coupling field. We also discuss methods to mitigate errors due to deviations of the laser detuning. The designed pulses operate on timescales that are short compared to the fundamental decay timescale set by spontaneous emission and blackbody radiation. We account for the finite lifetime of the Rydberg state in both the optimisation and fidelity calculations - this makes the gates conducive to noisy intermediate-scale quantum experiments, meaning that our protocols can reduce infidelity on near-term quantum computing devices. We calculate physical properties associated with infidelity for strontium-88 atoms - including lifetimes, polarisabilities and blockade strengths - and use these calculations to identify optimal Rydberg states for our protocols, which allows for further minimisation of infidelity.
