Circuit design solutions for a quantum key distribution system intended for installation on unmanned aerial vehicles

Subject of study . Circuit design solutions for a quantum key distribution system implemented on unmanned aerial vehicles are investigated. Aim of study . The aim is to develop a compact and energy-efficient quantum key distribution system, adapted for installation on unmanned aerial vehicles, and capable of stable key generation under atmospheric optical signal propagation. Method . Computer simulation of optical circuits and modeling of flight conditions, including turbulence and atmospheric interference, are used to assess noise immunity, particularly emphasizing efficiency under limited resource conditions. Main results . An atmospheric optical scheme for implementing the BB84 protocol with decoy-state technology is proposed. A two-pass tracking system for stable alignment and synchronization under movement and vibrations is developed. In addition, optimal aperture parameters (diameter 4–7 cm) for operation at distances of up to 1000 m are determined. Practical significance . The developed solutions enable the creation of a mobile quantum key distribution system for rapid deployment in hard-to-reach areas. The compact size and low power consumption of the system make it compatible with small and medium unmanned aerial vehicles, thereby expanding opportunities for secure communication in emergency situations, remote-area monitoring (e.g., forest fires and floods), agriculture, and infrastructure protection.