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arXiv 1902.02689cond-mat.mes-hall
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用压控滤波器抑制准粒子中毒

Suppressing quasiparticle poisoning with a voltage-controlled filter

Gerbold C. Ménard, Filip K. Malinowski, Denise Puglia, Dmitry I. Pikulin, Torsten Karzig, Bela Bauer, Peter Krogstrup, Charles M. Marcus

摘要:

我们研究了在Al/InAs纳米线混合系统中的单电子充电事件与故意引入的无带隙区域。库仑岛的占据使用附近的射频量子点作为电荷传感器来检测。我们证明,1微米的间隙段的导线可以用来有效地抑制单电子中毒的无间隙区域,因此保护奇偶性的岛,同时保持良好的电接触与正常的铅。在没有充电能量保护的情况下,1 e开关速率可以降低到每秒200次以下。在相同的配置中,我们观察到强烈的量子电荷波动,由于岛和铅之间的电子对交换。中毒率的磁场依赖性产生约90 nm的零场超导相干长度。

英文摘要:

We study single-electron charging events in an Al/InAs nanowire hybrid system with deliberately introduced gapless regions. The occupancy of a Coulomb island is detected using a nearby radio-frequency quantum dot as a charge sensor. We demonstrate that a 1 micron gapped segment of the wire can be used to efficiently suppress single electron poisoning of the gapless region and therefore protect the parity of the island while maintaining good electrical contact with a normal lead. In the absence of protection by charging energy, the 1e switching rate can be reduced below 200 per second. In the same configuration, we observe strong quantum charge fluctuations due to exchange of electron pairs between the island and the lead. The magnetic field dependence of the poisoning rate yields a zero-field superconducting coherence length of ~ 90 nm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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