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We realized lithographically-defined electrically-tunable silicon quantum dot (QD) and charge sensor. Two types of device were fabricated and measured. One is heavily P-doped, and the other is back gate (BG)-induced undoped QD device. I–V characteristic of QD and charge sensor was clearly observed in both devices. Then, we estimate capacitance between the charge sensor and QD or two side gates (SGs)...
We investigate novel serially-connected multiple single-electron transistors (MSETs) as a single-charge polarisation readout for silicon integrated charge qubits. We first design and analyse the double single-electron transistors (DSETs) in which double quantum dots are connected in series with two side gates. We show that the DSETs are sufficiently sensitive to distinguish all the single-charge polarisation...
Double quantum dots (DQDs) have been studied as attractive candidates for charge qubits. Initially, GaAs-based DQDs formed by means of surface gates depletion were studied because many parameters are tunable after their fabrications [1]. However, silicon-based DQDs are more promising for charge qubits because of the absence ofpiezoelectric electron-phonon coupling, and the effect of phonon localization...
In this work, we focus on the design optimization and the analysis of the latter device in order to evaluate its merit and demerit. We propose a realistic low-voltage window design methodology, which could actually also be used for systematical design of conventional NEMS switches. We also demonstrate some applications that arise from the movable gate, such as a way to cope with the random background...
This paper reports on integration of two silicon (Si) charge quantum bits (qubits) and series-connected double single-electron transistors (DSETs) as readout for the first time. We design and fabricate the DSETs composed of double quantum dots (DQDs) connected in series with two side gates patterned on a silicon-on-insulator substrate. The individual SETs are sufficiently sensitive to detect single-charge...
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