Quantum Computing Inc. and Ciena have successfully demonstrated a quantum-secure communications system at OFC 2026, showcasing a robust defense against both current and future cyber threats1. This innovative architecture combines quantum key distribution (QKD) based on time-frequency entanglement with classical authentication and high-speed optical encryption using AES-256-GCM. By integrating these technologies on Ciena's Waveserver platform, the companies have created a layered security approach that protects data from existing cyber risks and potential future attacks from quantum computers. The demonstration underscores the importance of preparing for a post-quantum world, where traditional cryptographic methods may be vulnerable to quantum-powered attacks. As quantum computing capabilities advance, the need for quantum-secure communications and post-quantum cryptography (PQC) migration planning becomes increasingly urgent, making this development a critical step towards securing sensitive data and communications.