Silicon photonics integrated circuit for quantum computation

The primary goal of this research is to develop and implement a complete Silicon Photonic Inte grated Circuit within the framework of Linear Optics Quantum Computing. This involves opti mizing the layout and fabrication of photonic circuits tailored for quantum computing applications using linear optics principles. As a prototype, the universal two-qubit Controlled-NOT gate is employed. This gate operates on a linear, coincidence basis, executing all the functions of a controlled-NOT gate and requiring only single photons at the input. The photonic quantum circuit incorporates various components, including directional couplers, spot size converters, and grating couplers, with a focus on optimizing the layout for the fabrication process. The integration of a heterojunction of Bi2Se3 and n-Si on the optical chip enhances the detec tion stage by leveraging efficient IR absorption and Dirac–like metallic surface properties. Single photon sources are integrated through ion implantation in silicon to create emitter centers in the telecom C-band, enabling efficient and controlled generation of single photons for quantum computing applications. Additionally, this study explores the potential of novel quantum-device concepts, such as heterostructured semiconductor nanowires, graphene, and other 2D materials, for manipulating the polarization of light to serve quantum computing purposes.