High-efficiency Cooper pair splitting demonstrated by two-particle conductance resonance and positive noise cross-correlation
High-efficiency Cooper pair splitting demonstrated by two-particle conductance resonance and positive noise cross-correlation
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DOI：
10.1038/ncomms2169
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发表时间：
2012-11-01
影响因子：
16.6
通讯作者：
Shtrikman, Hadas
中科院分区：
文献类型：
--
作者：
Das, Anindya;Ronen, Yuval;Shtrikman, Hadas
纠缠是爱因斯坦-波多尔斯基-罗森悖论的核心，非定域性是其中的一个必要因素。超导体中的库珀对可以被分裂，从而形成纠缠电子。在这里，我们制造这样的电子分离器通过接触铝超导带在中心的悬浮InAs纳米线。该纳米线在两端终止于两个正常的金属漏极。通过栅极诱导库仑阻塞量子点划分纳米线的每一半，由于大的充电能量，强烈地阻碍了库珀对的流动，同时仍然允许单个电子通过。我们提供了确凿的证据，极高效率的库珀对分裂通过观察积极的电导和散粒噪声的分裂电子在两个相反的纳米线漏的两个粒子相关。此外，注入准粒子的实际电荷通过散粒噪声测量进行了验证。
Entanglement is at the heart of the Einstein-Podolsky-Rosen paradox, where the non-locality is a necessary ingredient. Cooper pairs in superconductors can be split adiabatically, thus forming entangled electrons. Here, we fabricate such an electron splitter by contacting an aluminium superconductor strip at the centre of a suspended InAs nanowire. The nanowire is terminated at both ends with two normal metallic drains. Dividing each half of the nanowire by a gate-induced Coulomb blockaded quantum dot strongly impeds the flow of Cooper pairs due to the large charging energy, while still permitting passage of single electrons. We provide conclusive evidence of extremely high efficiency Cooper pair splitting via observing positive two-particle correlations of the conductance and the shot noise of the split electrons in the two opposite drains of the nanowire. Moreover, the actual charge of the injected quasiparticles is verified by shot noise measurements.