论文标题
rydberg原子的时间优势两小时
Time-Optimal Two- and Three-Qubit Gates for Rydberg Atoms
论文作者
论文摘要
我们确定了最佳时间激光脉冲，以实现受控的-z门及其三个Qubit概括，即C $ _2 $ z GATE，用于封锁制度中的Rydberg Atoms。使用数值和半分析量子最佳控制技术的组合对脉冲进行优化，从而使平滑的Ansätze仅使用几个变化参数。对于CZ门，时间优势实现对应于不需要原子单位地址的全局激光脉冲，从而简化了栅极的实验实现。我们采用量子最佳控制技术来减轻由于Rydberg状态的有限寿命和有限的封锁强度而引起的错误，而短门持续时间则直接减轻了影响门的其他几种错误。对于所考虑的误差源，我们使用CZ和C $ _2 $ z门的合理实验参数实现了与误差校正兼容的理论门保真度。
We identify time-optimal laser pulses to implement the controlled-Z gate and its three qubit generalization, the C$_2$Z gate, for Rydberg atoms in the blockade regime. Pulses are optimized using a combination of numerical and semi-analytical quantum optimal control techniques that result in smooth Ansätze with just a few variational parameters. For the CZ gate, the time-optimal implementation corresponds to a global laser pulse that does not require single site addressability of the atoms, simplifying experimental implementation of the gate. We employ quantum optimal control techniques to mitigate errors arising due to the finite lifetime of Rydberg states and finite blockade strengths, while several other types of errors affecting the gates are directly mitigated by the short gate duration. For the considered error sources, we achieve theoretical gate fidelities compatible with error correction using reasonable experimental parameters for CZ and C$_2$Z gates.
