Grant: Strategic Projects - Group

Technologies that exploit the complexity of quantum mechanics will lead to computing, secure communications, sensing, and metrology systems that greatly exceed the capabilities of our current technologies. The most promising approach is the quantum network, or 'quantum internet', where light is used to transmit quantum information over large distances (typically using low-loss fiber optics), and atoms or solid-state materials are used (at network nodes) to process and store this information.*The interaction between light and atoms is inherently weak, posing one of the greatest challenges associated with quantum technology development. Placing atoms or solid-state materials between two mirrors (a so-called optical cavity) strongly increases the efficiency of light-matter interactions, especially as the cavity is scaled to microscopic dimensions. Practical engineering solutions are needed for embedding atoms and nano-scale solid-state materials into micro-scale optical cavities, and for building systems that comprise large numbers of such cavities. This remains as a significant, unsolved technological challenge.*We have recently developed a new process for fabricating arrays of high-quality, microscopic optical cavities on a single chip. We have already achieved some key milestones, including operation in wavelength ranges relevant to quantum computing, and a combination of optical properties that should enable coherent atom-photon interactions.*Building on this, we propose a long-term vision to implement 'quantum chips', which combine arrays of on-chip micro-cavities, techniques for precisely locating atoms and mechanical resonators within these cavities, and on-chip electrical wiring for tuning of optical properties, control of atoms, and as an interface for microwave signals. We will use these chips to implement integrated sources of single photons (single light particles) and integrated systems to convert quantum information between the microwave and optical domains. This work promises to place Canada at the forefront of widely sought quantum information technologies.*