University of Twente Student Theses


Design and characterization of LC resonators for RF reflectometry charge readout of quantum dots

Leeuw, N. de (2022) Design and characterization of LC resonators for RF reflectometry charge readout of quantum dots.

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Embargo date:1 November 2027
Abstract:In order to readout a quantum dot, RF reflectometry can be used which offers a great speed advantage in contrast to low-frequency conductance measurements. One of the key factors to make this technique work is the use of properly designed and characterized LC resonators. Inductors and capacitors are treated both separately and combined, such that more knowledge about the individual components and general LC resonators is obtained. One of the most important factors when designing LC resonators is the quality factor, especially for obtaining some standardization in the design process of the LC resonator. 3 simulation sets are treated. A formula was derived, such the relation between the output impedance, input impedance, inductor and capacitor is related to the quality factor of the resonator. Three simulation sets were performed. In the first simulation set, the optimal value of the capacitor was calculated for a certain range of inductors according to the formula that was previously mentioned. This was done for three types of output impedances, from which it was concluded that for a higher output impedance, the resonance frequencies are in a higher frequency region. The reflection coefficients did not necessarily increase, which was expected due to the higher quality factor possible for higher output impedances. A second simulation set has been performed which explored this further. It turned out that for very high output impedances, small deviations in the inductance value causes steep oscillation of the minimum reflection coefficient. A third simulation set showed the effect the parasitic parallel capacitance of the inductor and how to minimize this effect. Measurements have been performed as well, which showed the first steps towards RF reflectometry. Follow-up research might include replacing the inductor with superconducting inductors, such that the quality factor can be increased further.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:31 mathematics, 33 physics, 53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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