论文标题

优化Rydberg大门以进行逻辑量子性能

Optimizing Rydberg Gates for Logical Qubit Performance

论文作者

Jandura, Sven, Thompson, Jeff D, Pupillo, Guido

论文摘要

强大的门序列被广泛用于降低门操作对实验缺陷的敏感性。通常,优化使平均门误差最小化,但是,量子误差校正的最新工作表明,编码逻辑Qubits的性能不仅对平均错误率,而且对发生的错误类型敏感。在这里,我们为中性原子Qubits介绍了一个rydberg封锁大门,它们与两个常见的,主要的不完美不完美:强度不均匀性和多普勒偏移。这些大门的表现优于中等或大瑕疵的现有门。我们还考虑了基于亚稳态$〜^{171} $ yb的擦除偏置量子的上下文中这些门的逻辑性能。在这种情况下,我们观察到,健壮的门的表现超过了现有的大门,即使是非常小的缺陷值,因为它们对这些量子的擦除错误保持了较大的偏见。这些结果大大降低了激光稳定性和原子温度的需求,以实现具有中性原子的耐断层量子计算。优化逻辑Qubit性能的门的方法可以应用于其他Qubit平台。

Robust gate sequences are widely used to reduce the sensitivity of gate operations to experimental imperfections. Typically, the optimization minimizes the average gate error, however, recent work in quantum error correction has demonstrated that the performance of encoded logical qubits is sensitive to not only the average error rate, but also the type of errors that occur. Here, we present a family of Rydberg blockade gates for neutral atom qubits that are robust against two common, major imperfections: intensity inhomogeneity and Doppler shifts. These gates outperform existing gates for moderate or large imperfections. We also consider the logical performance of these gates in the context of an erasure-biased qubit based on metastable $~^{171}$Yb. In this case, we observe that the robust gates outperform existing gates for even very small values of the imperfections, because they maintain the native large bias towards erasure errors for these qubits. These results significantly reduce the laser stability and atomic temperature requirements to achieve fault-tolerant quantum computing with neutral atoms. The approach of optimizing gates for logical qubit performance may be applied to other qubit platforms.

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