Development of optically controlled spin gate using group III-nitrides quantum dots

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Quantum dots (QDs) are attractive candidates for storing quantum information such as quantum bits (qubits). In site-controlled, heterostructure QDs, electron spins can be isolated, enabling easy interfacing with photonic (flying) qubits for large-scale quantum networks.Optical manipulation of spins has emerged as a viable technique to couple two spin qubits in two separate quantum dots. In contrast to vertical coupling, laterally coupled QDs enables individual control as well as allow scaling for multi-qubit processing. III-nitride QDs exhibit unique properties including low dielectric constant matrix, strong piezoelectric field, and large electron/hole effective masses, making possible to use them to build two-qubit controlled phase gate. This collaborative project aims to fabricate and demonstrate high-purity, defects-free QDs with narrow spectral linewidths. Building on the success of this project, in the long term, we will demonstrate spin-spin controlled phase (CZ) gate between two or more QDs. The development of spectrally pure, site-selective QDs will be the essential first step and crucial to enabling versatile quantum computational functionalities. To this end, leveraging their complementary expertise, know-how, facilities, and intensive synergy, the applicants (Dr. Sharif Sadaf and Dr. Pei-Cheng Ku) aim to deliver an efficient and scalable platform for making deterministic two-qubit gates using technologically feasible quantum dots structure. State-of-the-art semiconductor nanofabrication and characterization techniques will be utilized to realize the targeted quantum dot array. The project will be valuable for the entire quantum photonics community and the widespread commercialization of quantum technologies. We will provide a significant contribution towards the development of a quantum secure communication network using semiconductor QDs. The targeted outcomes will benefit the Canadian quantum industry through the training of highly qualified personnel in the fields of quantum photonics. This will also create careers in academia and industry, as well as will contribute to strengthening Canada among the leading players in the quantum communication sector.