Master Thesis Defense: Nikolaos Giannopoulos

This project investigates the implementation of quantum gates between adjacent quantum dots by leveraging the intrinsic dipole moment of each dot in their excited state for interaction. Appropriately aligning the quantum dots allows for robust and controllable interactions crucial for gate operations. We develop various methodologies to exploit this interaction for realizing quantum gates between qubits encoded in the ground state spins of quantum dots.

We examine an ideal regime where the control laser’s driving strength greatly exceeds the interaction strength between the dots. We investigate decay effects on the system and demonstrate almost ideal fidelity, confirming the feasibility of the method. Next, we develop a more practical implementation of the gate in a regime where the interaction strength surpasses the control laser’s driving strength. We assess fidelity for both on and off-resonance cases, optimizing gate performance by effectively manipulating various parameters, demonstrating fidelity exceeding 99.7% for a dipole-dipole interaction strength-to-decay rate ratio of 10^3, a realistically achievable parameter for the system under consideration.