We study how Quantum Keyless Private Communication (QKPC) performs when background noise is high, such as in daylight free-space links. The work outlines security and implementation considerations and shows that practical operating regimes remain viable under strong noise with appropriate filtering and timing.

This article presents a compact, low-cost QKD demonstrator designed for classrooms and public engagement. It details the optical layout, alignment tips, and teaching activities that make quantum cryptography tangible for non-specialists.

We propose and analyze a CubeSat-compatible optical terminal that supports both QKD and keyless quantum communication modes. The design discusses link budgets, pointing requirements, and component choices to enable robust space-to-ground quantum links.

This work describes an ADCS architecture tailored to quantum communication missions, where precise pointing stability is critical. It outlines sensor/actuator choices and control loops compatible with small satellite platforms.

The thesis explores a passive photonic integrated circuit that implements core QKD operations on-chip. It discusses layout strategies and expected performance to reduce size, weight, and power while improving stability.