Cooper pair splitters are promising candidates for generating spin-entangled electrons. However, the splitting of Cooper pairs is a random and noisy process, which hinders further synchronized operations on the entangled electrons. To circumvent this problem, we here propose and analyze a dynamic Cooper pair splitter that produces a noiseless and regular flow of spin-entangled electrons. The Cooper pair splitter is based on a superconductor coupled to quantum dots, whose energy levels are tuned in and out of resonance to control the splitting process. We identify the optimal operating conditions for which exactly one Cooper pair is split per period of the external drive and the flow of entangled electrons becomes noiseless. To characterize the regularity of the Cooper pair splitter in the time domain, we analyze the $g^{(2)}$ function of the output currents and the distribution of waiting times between split Cooper pairs. Our proposal is feasible using current technology, and it paves the way for dynamic quantum information processing with spin-entangled electrons.

中文翻译：

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动态 Cooper 对分路器

库珀对分离器是产生自旋纠缠电子的有希望的候选者。然而，库珀对的分裂是一个随机且嘈杂的过程，阻碍了纠缠电子的进一步同步操作。为了规避这个问题，我们在这里提出并分析了一种动态 Cooper 对分离器，它产生无噪声且规则的自旋纠缠电子流。Cooper 对分离器基于与量子点耦合的超导体，其能级在共振内和共振外调谐以控制分裂过程。我们确定了最佳操作条件，在该条件下，每个外部驱动周期恰好有一对 Cooper 对被拆分，并且纠缠电子流变得无噪音。为了表征 Cooper 对分离器在时域中的规律性，我们分析了$G^{(2)}$输出电流的函数和分裂 Cooper 对之间等待时间的分布。我们的提议使用当前技术是可行的，它为使用自旋纠缠电子进行动态量子信息处理铺平了道路。