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arXiv 1503.08339cond-mat.mes-hallcond-mat.supr-conquant-ph
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基于半导体纳米线的超导量子比特

A Semiconductor Nanowire-Based Superconducting Qubit

T. W. Larsen, K. D. Petersson, F. Kuemmeth, T. S. Jespersen, P. Krogstrup, J. Nygard, C. M. Marcus

摘要:

我们介绍了一种基于半导体纳米线和外延生长的超导层的混合量子比特。类transmon器件(“gatemon”)的约瑟夫森能量由耗尽半导体弱连接区中的载流子的静电栅极控制。在这些第一代器件中,证明了与片上微波腔的强耦合和通过栅极电压脉冲的相干量子比特控制,产生了相当长的弛豫时间(0.8 μs)和失相时间(1 μs),超过栅极操作时间两个数量级。因为量子位控制依赖于电压而不是通量,所以电阻控制线中的耗散减少,屏蔽减少串扰,并且通量控制的缺乏允许在磁场中操作,这与拓扑量子信息相关。

英文摘要:

We introduce a hybrid qubit based on a semiconductor nanowire with an epitaxially grown superconductor layer. Josephson energy of the transmon-like device ("gatemon") is controlled by an electrostatic gate that depletes carriers in a semiconducting weak link region. Strong coupling to an on-chip microwave cavity and coherent qubit control via gate voltage pulses is demonstrated, yielding reasonably long relaxation times (0.8 μs) and dephasing times (1 μs), exceeding gate operation times by two orders of magnitude, in these first-generation devices. Because qubit control relies on voltages rather than fluxes, dissipation in resistive control lines is reduced, screening reduces crosstalk, and the absence of flux control allows operation in a magnetic field, relevant for topological quantum information.

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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