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

量子点(QD)是存储量子信息的有吸引力的候选材料，例如量子比特(Qbit)。在位置控制的异质结构量子点中，电子自旋可以被隔离，从而可以很容易地与大规模量子网络中的光子(飞行)量子比特对接。光学操纵自旋已经成为一种可行的技术，可以将两个独立的量子点中的两个自旋量子比特耦合在一起。与垂直耦合相反，横向耦合的量子点允许单独控制以及允许多量子比特处理的缩放。III-氮化物量子点具有低介电常数矩阵、强压电场和大的电子/空穴有效质量等独特的性质，使其有可能用来构建双量子比特控制的相位门。这个合作项目旨在制造和展示具有窄谱线宽的高纯度、无缺陷的量子点。在这个项目成功的基础上，从长远来看，我们将展示两个或更多量子点之间的自旋-自旋控制相(CZ)门。光谱纯净、有位置选择性的量子点的开发将是必不可少的第一步，也是实现多功能量子计算功能的关键。为此，申请者(谢里夫·萨达夫博士和顾培成博士)利用他们互补的专业知识、专门知识、设施和密集的协同作用，旨在提供一个高效和可扩展的平台，使用技术上可行的量子点结构来制造确定性的两个量子比特门。将利用最先进的半导体纳米制造和表征技术来实现目标量子点阵列。该项目将对整个量子光子学社区和量子技术的广泛商业化具有价值。我们将为发展使用半导体量子点的量子安全通信网络做出重大贡献。目标成果将通过培训量子光子学领域的高素质人员，使加拿大量子产业受益。这还将在学术界和工业界创造就业机会，并将有助于加强加拿大在量子通信领域的领先地位。

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.