论文标题
室温单光子源，带有近毫秒内置的内存
Room-temperature single-photon source with near-millisecond built-in memory
论文作者
论文摘要
非古典光子源是分布式量子网络的关键资源。具有内存能力的物质系统产生的光子特别有希望，因为它们可以集成到按需使用每个源的网络中。在各种固态和原子量子记忆中，由于其稳健性和潜在的可扩展性，室温原子蒸气特别有吸引力。迄今为止的室温光子源在其记忆时间或光子状态的纯度上受到限制。在这里，我们根据室温记忆演示了一个单光子源。在预示着内存的载荷后，在可变存储时间后将从中检索一个光子。检索到的字段的单光子特征通过强抑制两光子组件的强烈抑制作用，其抗抗激素低至$ g^{（2）} _ {\ text {rr | w = 1}} = 0.20 \ pm pm 0.07 $。预示和检索到的光子之间的非古典相关性可维持高达$τ_ {\ text {nc}}}^{\ mathcal r} =（0.68 \ pm 0.08）$ ms，比以前在其他房间体系系统中长达两个数量级。对于违反贝尔不等式的相关性，最多$τ_ {\ text {bi}} =（0.15 \ pm 0.03）$ ms。
Non-classical photon sources are a crucial resource for distributed quantum networks. Photons generated from matter systems with memory capability are particularly promising, as they can be integrated into a network where each source is used on-demand. Among all kinds of solid state and atomic quantum memories, room-temperature atomic vapours are especially attractive due to their robustness and potential scalability. To-date room-temperature photon sources have been limited either in their memory time or the purity of the photonic state. Here we demonstrate a single-photon source based on room-temperature memory. Following heralded loading of the memory, a single photon is retrieved from it after a variable storage time. The single-photon character of the retrieved field is validated by the strong suppression of the two-photon component with antibunching as low as $g^{(2)}_{\text{RR|W=1}} = 0.20 \pm 0.07$. Non-classical correlations between the heralding and the retrieved photons are maintained for up to $τ_{\text{NC}}^{\mathcal R} = (0.68\pm 0.08)$ ms, more than two orders of magnitude longer than previously demonstrated with other room-temperature systems. Correlations sufficient for violating Bell inequalities exist for up to $τ_{\text{BI}} = (0.15 \pm 0.03)$ ms.
