基于50个可单独寻址的中性原子的可扩展芯片集成单光子源阵列
A scalable chip-integrated single-photon source array based on 50 individually addressable neutral atoms
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中文总结 AI 辅助
该研究展示了基于50个可单独寻址的$^{87}\text{Rb}$原子的芯片集成单光子源阵列，通过玻璃波导分路器实现光纤接口，填充率达93%，可扩展至784通道，为光子量子信息处理提供了光纤原生中性原子平台。
中文摘要 AI 辅助
可扩展的相同单光子源阵列是光子量子信息处理、量子网络和量子计量学的核心资源。中性原子提供了本质上相同的发射体，可在光镊中组装和重排，但与单独囚禁原子连接的多通道光纤接口一直是一项重大技术挑战。在此，我们展示了一种基于50个可单独寻址的$^{87}\text{Rb}$原子的芯片接口单光子源阵列。玻璃波导分路器将光镊阵列的5μm间距转换为商用光纤阵列的127μm间距，将每个原子映射到其自身的波导、光纤和单光子探测器。我们解析了全部50个通道，平均相邻串扰为0.4%，插入损耗均匀为2.9 dB，且通过$g^{(2)}(0)=0.29$验证了单光子发射，该值目前受探测器暗计数和残余冷却光散射限制。结合每个通道的原子识别、重排和储备补充，我们制备了最多含24个原子的源子阵列，填充率达93%。对于小目标数量，原子损耗以探测限制的118 Hz速率从储备中修复。我们还制备了784通道的波导芯片，表明该光子接口可扩展至远超当前的数量。该架构建立了一种光纤原生的中性原子平台，用于构建更大规模的相同单光子源阵列。
英文摘要
Scalable arrays of identical single-photon sources are a central resource for photonic quantum information processing, quantum networks and quantum metrology. Neutral atoms provide intrinsically identical emitters that can be assembled and rearranged in optical tweezers, but a many-channel fiber interface to individually trapped atoms has remained a major technical challenge. Here we demonstrate a chip-interfaced single-photon source array based on 50 individually addressable $^{87}\mathrm{Rb}$ atoms. A glass waveguide fan-out converts the \SI{5}{\micro m} pitch of the optical-tweezer array to the \SI{127}{\micro m} pitch of a commercial fiber array, mapping each atom to its own waveguide, fiber and single-photon detector. We resolve all 50 channels with an average nearest-neighbor cross-talk of $0.4\%$ and a uniform insertion loss of \SI{2.9}{dB}, and verify single-photon emission with $g^{(2)}(0)=0.29$, presently limited by detector dark counts and residual cooling-light scattering. Combining per-channel atom discrimination, rearrangement and reservoir replenishment, we prepare source subarrays of up to 24 atoms with a $93\%$ fill fraction. For small target numbers, atom loss is repaired from the reservoir at the detection-limited rate of \SI{118}{Hz}. We further fabricate a 784-channel waveguide chip, showing that the photonic interface can be extended well beyond the present number. This architecture establishes a fiber-native neutral-atom platform for larger arrays of identical single-photon sources.
