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arXiv 1503.06399cond-mat.mes-hall
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马约拉纳纠缠桥

Majorana Entanglement Bridge

S. Plugge, A. Zazunov, P. Sodano, R. Egger

摘要:

研究了超导浮岛上两个量子点与Majorana束缚态纠缠的并发性。马约拉纳状态之间的距离,岛的充电能量和平均岛电荷被证明是纠缠产生效率的决定性参数。我们发现,远程纠缠基本上与距离无关的并发是可能的,在广泛的参数区域,建议的设置实现了“马约拉纳纠缠桥”。我们还研究了其中一个隧道耦合突然开启后所获得的依赖于时间的纠缠度,揭示了纠缠产生的时间尺度。精确的解析表达式的并发推导出静态和时间依赖的情况下。我们的研究结果表明,纠缠形成在相互作用的马约拉纳设备可以完全理解的相互作用的弹性cotunneling(也被称为“隐形传态”)和交叉Andreev反射过程。

英文摘要:

We study the concurrence of entanglement between two quantum dots in contact to Majorana bound states on a floating superconducting island. The distance between the Majorana states, the charging energy of the island, and the average island charge are shown to be decisive parameters for the efficiency of entanglement generation. We find that long-range entanglement with basically distance-independent concurrence is possible over wide parameter regions, where the proposed setup realizes a "Majorana entanglement bridge". We also study the time-dependent concurrence obtained after one of the tunnel couplings is suddenly switched on, which reveals the timescales for generating entanglement. Accurate analytical expressions for the concurrence are derived both for the static and the time-dependent case. Our results indicate that entanglement formation in interacting Majorana devices can be fully understood in terms of an interplay of elastic cotunneling (also referred to as "teleportation") and crossed Andreev reflection processes.

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