We show that induced dipole-dipole interactions allow for photon blockade in subwavelength ensembles of two-level, ground-state neutral atoms. Our protocol relies on the energy shift of the single-excitation, superradiant state of $N$ atoms, which can be engineered to yield an effective two-level system. A coherent pump induces Rabi oscillation between the ground state and a collective bright state, with at most a single excitation shared among all atoms. The possibility of using clock transitions that are long-lived and relatively robust against stray fields, alongside new prospects on experiments with subwavelength lattices, makes our proposal a promising alternative for quantum information protocols.

中文翻译：

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具有基态中性原子的光子阻挡

我们表明，诱导的偶极-偶极相互作用允许光子在两级，基态中性原子的亚波长集合中受阻。我们的协议依赖于单激发，超辐射态的能量转移$ñ$原子，可以进行工程设计以产生有效的两级系统。相干泵在基态和集体亮态之间引发Rabi振荡，所有原子之间最多共享一个激发。使用寿命长且相对于杂散场相对鲁棒的时钟转换的可能性，以及使用亚波长晶格进行实验的新前景，使我们的建议成为量子信息协议的有希望的替代方案。