超伝導－グラフェン接合を利用した量子エンタングラー

我已经成功地在基于石墨烯的设备中演示了高效的库珀对分裂。纠缠电子的来源对量子计算的未来至关重要。库珀对分光器是迄今为止最成功的固体纠缠电子源之一，效率在90%以上。我们的器件是仿照超导体双量子点器件设计的；然而，我们利用一个真正的“y形”设计有效地将分裂通道更紧密地放在一起。此外，与以前的设计不同，传统超导体与不同材料的量子点（QD）的隧道屏障不同，我们利用石墨烯作为中央超导电极和QD输出通道。石墨烯中的超导性是通过邻近效应诱导的，从而产生了大的测量超导间隙Δ和长相干长度。石墨烯-石墨烯平面二维超导体-量子点界面降低了量子点的电容，从而增加了充电能量。结果，我们测量到的分裂效率高达62%。最后，该器件利用CVD生长的石墨烯，允许标准化的器件设计，具有增加复杂性和工业化的潜力。

I have successfully demonstrated high efficiency Cooper pair splitting in a graphene-based device. A source of entangled electrons is essential to the future of Quantum computing. Cooper pair splitter device is one of the most successful solid state sources of entangled electrons so far, with efficiencies above 90%. Our device is modeled on the superconductor-two quantum dot device; however, we utilize a true “Y-shape” design effectively placing the splitting channels closer together. Moreover, unlike previous designs where a conventional superconductor was used with tunnel barriers to the quantum dots (QD) of a different material, we utilize graphene as the central superconducting electrode as well as QD output channels. Superconductivity in graphene is induced via the proximity effect, thus resulting in both a large measured superconducting gap Δ, and a long coherence length. The graphene-graphene, flat, two dimensional, superconductor-QD interface lowers the capacitance of the quantum dots, thus increasing the charging energy. As a result we measured a splitting efficiency of up to 62%. Finally, the devices utilize CVD grown graphene allowing for a standardized device design with potential for increased complexity and industrialization.