Numerical Security Framework for Quantum Key Distribution with Bypass Channels

Satellite based quantum key distribution QKD aims to establish secure key exchange over long distances despite significant technological challenges. To alleviate some of these challenges, Ghalaii et al. PRX Quantum 4, 040320 2023 proposed that any airborne eavesdropper up to a certain size can be...

QuaNTUM: A Modular Quantum Communication Testbed for Scalable Fiber and Satellite Integration

Secure communication is essential for modern society, from financial transactions to critical infrastructure. As classical encryption faces threats from advancing computational power, quantum communication provides a fundamentally secure alternative based on physical laws. We present QuaNTUM...

Energy-Time Attack on Detectors in Quantum Key Distribution

Quantum key distribution is unbreakable in theory but may be hacked via imperfections in its hardware implementations. While many imperfections have been mitigated by countermeasures and advanced security proofs, several remain unsolved. One of these is a superlinear behaviour in single-photon...

Time-Bin Encoded Quantum Key Distribution over 120 Km with a Telecom Quantum Dot Source

Quantum key distribution QKD with deterministic single photon sources has been demonstrated over intercity fiber and free-space channels. The previous implementations relied mainly on polarization encoding schemes, which are susceptible to birefringence, polarization-mode dispersion and...