1. Electrical Control of Uniformity in Quantum Dot Devices
- Author
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Marcel Meyer, Corentin Déprez, Timo R. van Abswoude, Ilja N. Meijer, Dingshan Liu, Chien-An Wang, Saurabh Karwal, Stefan Oosterhout, Francesco Borsoi, Amir Sammak, Nico W. Hendrickx, Giordano Scappucci, and Menno Veldhorst
- Subjects
Quantum Physics ,Condensed Matter - Mesoscale and Nanoscale Physics ,Mechanical Engineering ,FOS: Physical sciences ,quantum dot ,spin qubit ,Bioengineering ,General Chemistry ,Condensed Matter Physics ,uniformity ,hysteresis ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,General Materials Science ,Quantum Physics (quant-ph) - Abstract
Highly uniform quantum systems are essential for the practical implementation of scalable quantum processors. While quantum dot spin qubits based on semiconductor technology are a promising platform for large-scale quantum computing, their small size makes them particularly sensitive to their local environment. Here, we present a method to electrically obtain a high degree of uniformity in the intrinsic potential landscape using hysteretic shifts of the gate voltage characteristics. We demonstrate the tuning of pinch-off voltages in quantum dot devices over hundreds of millivolts that then remain stable at least for hours. Applying our method, we homogenize the pinch-off voltages of the plunger gates in a linear array for four quantum dots, reducing the spread in pinch-off voltages by one order of magnitude. This work provides a new tool for the tuning of quantum dot devices and offers new perspectives for the implementation of scalable spin qubit arrays.
- Published
- 2023