zerothird

zerothird provides quantum-grade security solutions using entanglement-based cryptography, designed to resist both classical and quantum attacks. The company's product suite includes Key-as-a-Service (KaaS) for enterprise-grade quantum keys delivered as a managed service, entanglement-based Quantum Key Distribution (QKD) systems for high-speed long-distance quantum encryption, and quantum lab equipment including precision photon sources for advanced research. Born from Nobel Prize-winning research in entanglement and detection, zerothird's technology generates keys locally from entangled states without key transmission or exposure, enabling eavesdropping detection through correlated measurements. The company serves critical infrastructure, enterprises, and governments with use cases including long-distance eQKD connecting cities, metro eQKD between buildings, and fully connected networks. zerothird has implemented pilots with Erste Group and A1 Telekom Austria, and won the EY Scale-up Award 2026. Founded in 2023 and headquartered in Vienna, Austria, the company has raised $10 million in Seed funding from investors including Sparring Capital, Findus Venture, KGAL, and Verbundx.