Date of Graduation


Document Type


Degree Name

Bachelor of Science in Electrical Engineering

Degree Level



Electrical Engineering


Churchill, Hugh

Committee Member/Reader

El-Shenawee, Magda

Committee Member/Second Reader

Singh, Surendra


The current limitations of qubit-based processors are caused by imperfections in quantum gates, leading to a lack of gate fidelity. Gate fidelity can be refined by extending the coherence of qubits and reducing logic operation speed. A potential solution is to develop a hybrid qubit that has the coherence of electrically-controlled quantum dots and the gate speed of their optically-controlled counterparts. Quantum bits that utilize ultrafast optical gating to perform gate operations require precise control of the gating pulse duration. Optical dispersion can cause adverse effects pulse duration, such as pulse broadening, so dispersion-compensation techniques must be employed; by properly managing dispersion in the gating pulses, the desired pulse durations can be obtained. This thesis presents the theory behind optical manipulation of quantum dots, proposed device designs based on ambipolar quantum dots, and a common method for measuring ultrashort laser pulses based on intensity autocorrelation


ambipolar quantum dots, ultrafast optical gating, single-electron transistor, radio frequency reflectometry, intensity autocorrelation, group velocity dispersion