基于非对称Rydberg相互作用的球结构多比特Toffoli门
Spheroidal-structure-based multi-qubit Toffoli gate via asymmetric Rydberg interaction
摘要：
我们提出了一个异国情调的多量子比特Toffoli门协议，通过非对称里德堡封锁，受益于使用的球形配置，以优化门的性能。球形结构的优点在于在球内的所有控制-靶原子对之间很好地保存了强阻塞能量，这可以持续地将阻塞误差保持在低水平。在对三种不同类型的$(2+1)$门单元进行最小化反封锁误差优化的基础上，最佳$(6+1)$结构的门保真度可达$0.9841$，主要由衰减误差贡献.并讨论了控制原子数目增加时的扩展问题。我们的研究结果可能有助于在特殊的高维阵列中实现可扩展的中性原子量子计算。
英文摘要：
We propose an exotic multi-qubit Toffoli gate protocol via asymmetric Rydberg blockade, benefiting from the use of a spheroidal configuration to optimize the gate performance. The merit of a spheroidal structure lies in a well preservation of strong blocked energies between all control-target atom pairs within the sphere, which can persistently keep the blockade error at a low level. On the basis of optimization for three different types of $(2+1)$-$qubit$ gate units to minimize the antiblockade error, the gate fidelity of an optimal $(6+1)$-$qubit$ configuration can attain as high as $0.9841$ mainly contributed by the decay error. And the extension with much more control atoms is also discussed. Our findings may shed light on scalable neutral-atom quantum computation in special high-dimensional arrays.
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