Integrated multi-mode waveguide devices for quantum communication

Quantum information processing, or more specifically, quantum communication, is the future of information technology. However, this mode of communication faces several challenges for its practical implementation, such as compatibility with the current integrated optics technology. This paper conceptually implements quantum communication at the device level using integrated optics. We implement the quantum communication in a waveguide-based circuit using an indigenously developed high-dimensional quantum key distribution protocol. High-dimensional quantum key distribution is a technique that provides higher information efficiency compared to conventional quantum key distribution systems. We simulate this communication protocol using a device fabricated using silicon-on-insulator material. We have used this material since its fabrication technology is well established for integrated optics. We analytically show that integrated optics technology can be used to implement conventional quantum key distribution.