论文标题
带有延伸型斜纹膜的受控遗相门的错误预算
Error-budgeting for a controlled-phase gate with strontium-88 Rydberg atoms
论文作者
论文摘要
我们研究了Rydberg量子计算机中高保真控制栅极的实施。该协议基于相对于两个量子位的对称门，如Levine等人的实验实现[Phys。莱特牧师。 123，170503（2019）]，但允许随时间依赖性的失谐而进行任意脉冲形状。为了优化脉冲形状，我们引入了激光脉冲，从而使Rydberg州所花费的时间缩短了10％，并减少了对栅极不忠行为的主要贡献，即来自Rydberg State的衰减。值得注意的是，可以根据任何实验实现的要求，可以实现这种降低的脉冲和平滑的狂犬病频率的平滑脉冲。我们仔细分析了基本误差源，例如光子后坐力，显微镜相互作用电位以及原子的谐波捕获，以基于斜纹斜纹原子的实验逼真的设置。我们发现，对于实验参数的非常保守的估计，可能有可能达到99.9％的平均栅极保真度。
We study the implementation of a high fidelity controlled-phase gate in a Rydberg quantum computer. The protocol is based on a symmetric gate with respect to the two qubits as experimentally realized by Levine et al [Phys. Rev. Lett. 123, 170503 (2019)], but allows for arbitrary pulse shapes with time-dependent detuning. Optimizing the pulse shapes, we introduce laser pulses which shorten the time spent in the Rydberg state by 10% and reduce the leading contribution to the gate infidelity, i.e., the decay from the Rydberg state. Remarkably, this reduction can be achieved for smooth pulses in detuning and smooth turning on of the Rabi frequency as required in any experimental realization. We carefully analyze the influence of fundamental error sources such as the photon recoil, the microscopic interaction potential, as well as the harmonic trapping of the atoms for an experimentally realistic setup based on strontium-88 atoms. We find that an average gate fidelity above 99.9% is possible for a very conservative estimation of experimental parameters.
