Feasibility of All Single-Qubit Gates with Four InGaAs Quantum Dots Coupled to Two Silver Nanowires

We have proposed all single-qubit logic gates with four InGaAs quantum dots (QDs) coupled to a T-type plasmonic waveguides (PWs) wherein binary qubits are encoded by frequency of photons. Our results reveal that by adjusting distance between QDs, coupling strength and frequency detuning in a proper manner, an arbitrary single-qubit gates can be achieved. We investigated schemes theoretically via the real-space approach and estimated feasibilities of a proposed one by fidelities for a variety of parameters. Under the present technology and high fidelities, our proposed schemes are feasible, opening the promising perspectives for constructing quantum computation and quantum information processing.