Unhackable Codes: How Quantum Key Distribution is Reinventing Secure Communication
China’s Micius satellite enabled satellite-to-ground quantum key distribution over 1,200 km in 2016 and intercontinental QKD between Beijing and Vienna in 2017. In 2022, twin-field QKD reached 833 km in fiber. HSBC joined a London quantum-secured network in 2023. The NSA warns QKD is not ready for broad government use, urging a hybrid approach with post-quantum cryptography.