论文标题
对库珀对分裂的实时观察表现出强烈的非本地相关性
Real-time observation of Cooper pair splitting showing strong non-local correlations
论文作者
论文摘要
在空间分离的粒子之间的控制生成和检测量子纠缠构成了测试量子力学基础和实现未来量子技术的基础的必要先决条件。从超导体中拆分库珀对可在不同位置提供纠缠的电子。但是,在实验上访问单个拆分库珀对,构成了一个主要的问题,因为它们与竞争过程中的电子混合在一起。在这里,我们通过第一次实时观察单个库珀对的分裂来克服这一挑战,从而可以直接访问库珀对分裂的时间分辨统计数据。我们确定由两电子过程产生的相关统计数据,并找到一个明显的峰值,比背景大两个数量级。因此,我们的实验允许明确指出并选择99%保真度的拆分库珀对。这些结果为执行实验的途径开辟了一条途径,以挖掘库珀对的旋转范围。
Controlled generation and detection of quantum entanglement between spatially separated particles constitute an essential prerequisite both for testing the foundations of quantum mechanics and for realizing future quantum technologies. Splitting of Cooper pairs from a superconductor provides entangled electrons at separate locations. However, experimentally accessing the individual split Cooper pairs constitutes a major unresolved issue as they mix together with electrons from competing processes. Here, we overcome this challenge with the first real-time observation of the splitting of individual Cooper pairs, enabling direct access to the time-resolved statistics of Cooper pair splitting. We determine the correlation statistics arising from two-electron processes and find a pronounced peak that is two orders of magnitude larger than the background. Our experiment thereby allows to unambiguously pinpoint and select split Cooper pairs with 99 % fidelity. These results open up an avenue for performing experiments that tap into the spin-entanglement of split Cooper pairs.