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arXiv 2301.01650cond-mat.mes-hallphysics.app-phquant-ph
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一种作为分布式电荷传感器的细长量子点

An elongated quantum dot as a distributed charge sensor

S. M. Patomäki, J. Williams, F. Berritta, C. Laine, M. A. Fogarty, R. C. C. Leon, J. Jussot, S. Kubicek, A. Chatterjee, B. Govoreanu, F. Kuemmeth, J. J. L. Mort… 展开作者

S. M. Patomäki, J. Williams, F. Berritta, C. Laine, M. A. Fogarty, R. C. C. Leon, J. Jussot, S. Kubicek, A. Chatterjee, B. Govoreanu, F. Kuemmeth, J. J. L. Morton, M. F. Gonzalez-Zalba

AI总结:

本研究展示了一种细长量子点作为分布式电荷传感器,通过单电子盒实现对远程量子点的电荷检测,为紧凑量子处理器布局提供了新方案。

摘要:

增加半导体量子点之间的间距可通过便于栅极布线以及传感器和电荷库的集成来提供扩展优势。在GaAs异质结构中,细长量子点已被用于此目的,以扩展自旋-自旋相互作用的范围。在此,我们研究了一种金属-氧化物-半导体(MOS)器件,其中两个量子点阵列由一个细长量子点(长340 nm,宽50 nm)分隔。我们通过测量到库的射频单电子电流来监测细长量子点的电荷跃迁,该库连接了一个集总元件谐振器。我们将该量子点作为单电子盒运行,以实现对每个阵列中相距510 nm的远程量子点的电荷传感。在细长量子点两端的同时电荷检测表明,电荷在其标称长度上分布良好,这得到了模拟的量子力学电子密度的支持。我们的结果展示了如何以实现多功能足迹的方式实现单电子盒,这可能促成新颖且紧凑的量子处理器布局,除提供介导耦合的可能性外,还提供分布式电荷传感。

英文摘要:

Increasing the separation between semiconductor quantum dots offers scaling advantages by fa- cilitating gate routing and the integration of sensors and charge reservoirs. Elongated quantum dots have been utilized for this purpose in GaAs heterostructures to extend the range of spin-spin interactions. Here, we study a metal-oxide-semiconductor (MOS) device where two quantum dot arrays are separated by an elongated quantum dot (340 nm long, 50 nm wide). We monitor charge transitions of the elongated quantum dot by measuring radiofrequency single-electron currents to a reservoir to which we connect a lumped-element resonator. We operate the dot as a single electron box to achieve charge sensing of remote quantum dots in each array, separated by a distance of 510 nm. Simultaneous charge detection on both ends of the elongated dot demonstrates that the charge is well distributed across its nominal length, supported by the simulated quantum-mechanical electron density. Our results illustrate how single-electron boxes can be realised with versatile foot- prints that may enable novel and compact quantum processor layouts, offering distributed charge sensing in addition to the possibility of mediated coupling.

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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