Development of high-performance encoder for Asynchronous-Pairing QKD

Quantum Key Distribution (QKD) is one of the most advanced quantum technologies, aiming to enable unconditionally secure key exchange by exploiting the physical properties of quantum states. Since the introduction of the first QKD protocol, BB84, over forty years ago, numerous schemes have been proposed. One of the most promising recent approaches is Asynchronous-Pairing QKD (AP-QKD), which combines the strong security guarantees of Measurement-Device-Independent (MDI) protocols with enhanced robustness to losses, all while remaining compatible with low-complexity hardware implementations. This thesis presents the experimental realization of a high-performance encoder for AP-QKD, describing its design, performance, and potential for integration in practical quantum communication systems.