This book describes a broad research program on quantum communication. Here, a cryptographic key is exchanged by two parties using quantum states of light and t

Conventional quantum key distribution (QKD) uses a discrete two-dimensional Hilbert space for key encoding, such as the polarization state of a single photon. I

This book deals with applications in several areas of science and technology that make use of light which carries orbital angular momentum. In most practical sc

Quantum key distribution (QKD) exploits the inherent strangeness of quantum mechanics to improve secure communication, enabling two pre-authenticated participan

Single-photon generation and detection is at the forefront of modern optical physics research. This book is intended to provide a comprehensive overview of the