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WED-ID: Industry Day

WED-ID 3: Quantum Communication & Internet

WED-ID 3.4: Invited Talk

Wednesday, September 10, 2025, 16:00–16:20, ZHG101

Entanglement-based Quantum Key Distribution — •Sebastian Neumann — zerothird/Quantum Industries GmbH, Clemens-Holzmeister-Str. 6/6, 1100 Wien

Online security faces a fundamental threat: With the advent of quantum computing, the main encryption techniques used today will become vulnerable to attacks using Shor's algorithm. Quantum Key Distribution (QKD) is the only technology that can protect internet traffic in a future-proof way. Based on the no-cloning theorem, QKD allows for the creation of physically secure keys for unhackable secret communication. The gold standard of QKD are implementations based on entanglement (eQKD), since monogamy of entanglement intrinsically prevents any information leakage of the quantum state to other degrees of freedom. In my talk, I will introduce the concept of entanglement in a QKD context and present scientific publications whose findings are now being commercialized by zerothird. Special emphasis will be put on the challenges to be overcome for long-distance connections, for creating high key rates over short distances, and for connecting many users in a quantum network. I will also give an outlook regarding future technologies which rely heavily on entanglement, such as quantum repeaters and connections between quantum computers.

Keywords: Quantum Key Distribution; Entanglement; Long-distance connections; Quantum Networks; High key rates