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Polarization-entangled photon pairs from a single molecule
Optica ( IF 10.4 ) Pub Date : 2019-01-04 , DOI: 10.1364/optica.6.000034
Mohammad Rezai , Jörg Wrachtrup , Ilja Gerhardt

Photonic entanglement is one of the key resources in modern quantum optics. It opens the door to schemes such as quantum communication, quantum teleportation, and quantum-enhanced precision sensing. Sources based on parametric down-conversion or cascaded decays in atomic and atom-like emitters are limited because of their weak interaction with stationary qubits. This is due to their commonly broadband emission. Furthermore, these sources are commonly in the near-infrared such that quantum emitters in the blue spectral region, such as ions or many defect centers, cannot be addressed. Here, we present a sodium-resonant (589.0 nm) and narrow-band (14 MHz) degenerate entanglement source based on a single molecule. A beam-splitter renders two independently emitted photons into a polarization-entangled state. The quality of the entangled photon pairs is verified by the violation of Bell’s inequality. We measure a Bell parameter of S=2.26±0.05. This attests that the detected photon pairs exceed the classical limit; it is reconfirmed by quantum-state tomography and an analysis of the raw detector counts, which result in a value of S=2.24±0.12. The tomography shows fidelity of 82% to a maximally entangled Bell state. This work opens the route to background-free solid-state entanglement sources which surpass the probabilistic nature of the commonly used sources and are free from unwanted multi-photon events. The source is ideal for combination with stationary qubits such as atoms, ions, quantum dots, or defect centers.

中文翻译:

单个分子的偏振纠缠光子对

光子纠缠是现代量子光学的关键资源之一。它为诸如量子通信,量子隐形传态和量子增强的精密传感之类的方案打开了大门。基于参数下转换或原子和类原子发射器中的级联衰减的源受到限制,因为它们与固定量子位的交互作用较弱。这是由于它们通常是宽带发射的。此外,这些源通常在近红外中,因此无法解决蓝色光谱区域中的量子发射器(例如离子或许多缺陷中心)的问题。在这里,我们介绍基于单个分子的钠共振(589.0 nm)和窄带(14 MHz)简并纠缠源。分束器使两个独立发射的光子进入偏振纠缠态。纠缠了贝尔的不等式,证明了纠缠的光子对的质量。我们测量的贝尔参数为小号=2.26±0.05。这证明检测到的光子对超过了经典极限;通过量子状态层析成像和对原始检测器计数的分析再次确认了此结果,得出的值为小号=2.24±0.12。断层扫描显示最大纠缠的贝尔状态的保真度为82%。这项工作为通往无背景的固态纠缠源开辟了道路,这种纠缠源超越了常用源的概率性质,并且避免了不必要的多光子事件。该源非常适合与固定的量子位(例如原子,离子,量子点或缺陷中心)结合使用。
更新日期:2019-01-22
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