Date of Graduation
5-2021
Document Type
Thesis
Degree Name
Bachelor of Science in Electrical Engineering
Degree Level
Undergraduate
Department
Electrical Engineering
Advisor/Mentor
Churchill, Hugh
Committee Member/Reader
El-Shenawee, Magda
Committee Member/Second Reader
Singh, Surendra
Abstract
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
Keywords
ambipolar quantum dots, ultrafast optical gating, single-electron transistor, radio frequency reflectometry, intensity autocorrelation, group velocity dispersion
Citation
Tull, J. (2021). Optoelectronic Valley-Spin Qubits with Ambipolar Quantum Dots. Electrical Engineering Undergraduate Honors Theses Retrieved from https://scholarworks.uark.edu/eleguht/77
Included in
Electrical and Electronics Commons, Electromagnetics and Photonics Commons, Electronic Devices and Semiconductor Manufacturing Commons, Nanotechnology Fabrication Commons, Signal Processing Commons