论文标题
非古典相关的确定性单光子对，用于在双峰腔中被困的原子
Nonclassical correlated deterministic single-photon pairs for a trapped atom in bimodal cavities
论文作者
论文摘要
单光子和单光子对，本质上本质上是非古典的，是量子科学和技术的基本要素。在这里，我们建议在单光子水平上实现一个被困在双峰腔中的单个原子的非经典相关确定性光子对。结果表明，双峰腔的光子发射表现出较高的单个光子纯度和相对较大的腔内光子数，这归因于光学恒星移位的组合增强了能量光谱的非谐性和量子干扰，从而抑制了两光子激发。我们的方案通过构建高度可调的腔体增强的确定性参数下转换过程，生成具有强光子阻滞的光子光子对。此外，我们表明，两种腔模式之间的互相关函数极大地违反了经典边界的Cauchy-Schwarz不等式，这明确证明了单光子对的非经典性。我们的结果揭示了一种重要的策略，以产生具有强大非经典相关性的高质量的两种模式单光子源，该源可以在量子网络分布，长距离量子通信和量子物理的基本测试方面提供多功能应用。
Single photons and single-photon pairs, inherently nonclassical in their nature, are fundamental elements of quantum sciences and technologies. Here, we propose to realize the nonclassical correlated deterministic photon pairs at the single-photon level for a single atom trapped in bimodal cavities. It is shown that the photon emissions for bimodal cavities exhibit a high single photon purity and relatively large intracavity photon numbers, which are ascribed to the combination of optical Stark shift enhanced energy-spectrum anharmonicity and quantum interference suppressed two-photon excitation. Our scheme generates photon-photon pairs with strong photon blockade for cavity modes via constructing a highly tunable cavity-enhanced deterministic parametric down-conversion process. Furthermore, we show that the cross-correlation function between the two cavity modes vastly violates the Cauchy-Schwarz inequality of the classical boundary, which unambiguously demonstrates the nonclassicality of the single-photon pairs. Our result reveals a prominent strategy to generate the high-quality two-mode single-photon sources with strong nonclassical correlation, which could provide versatile applications in distribution of quantum networks, long distance quantum communication, and fundamental tests of quantum physics.
