In May 2025, China achieved a major milestone in cybersecurity by making the first encrypted voice call using quantum technology over more than 1,000 km between Beijing and Hefei. This feat relies on a national quantum key distribution (QKD) network covering 16 metropolitan areas, already protecting 500 government agencies and 380 state-owned enterprises. Meanwhile, China unveiled the Tianyan-504, a superconducting quantum computer with 504 qubits, accessible via the cloud and having logged over 12 million connections from 50 countries. These advancements mark a transition from the experimental stage to operational reality, signaling an acceleration towards "Q-Day", the moment when quantum computers will be able to break classical encryptions.