Alexandra Osicheva

The primary obstacle to expanding the reach of quantum cryptography lies in the exponential losses within quantum communication channels. We address this challenge by experimentally realizing the Quantum Control-based Key Distribution (QCKD) protocol, which utilizes physical control over signal losses and ensures that leaked quantum states remain substantially non-orthogonal. The present talk will detail our experiments with QCKD over a 1,707 km fiber optic line, showcasing its effectiveness and scalability. The scaling and performance of QCKD mark a significant step toward achieving globally secure, quantum-resistant communication.