Quantum 2025 – scientific programme

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WED-ID: Industry Day

WED-ID 3: Quantum Communication & Internet

WED-ID 3.5: Invited Talk

Wednesday, September 10, 2025, 16:25–16:45, ZHG101

From entangled photon-pair sources to post-quantum cyber security solutions — •Kevin Füchsel — Quantum Optics Jena GmbH, Jena, Germany

Secure and trustworthy communication is the foundation of our digital communication. Until now, complex mathematical cryptography algorithms have been used for this purpose. With the increasing power of artificial intelligence and quantum computers, this methodology faces the challenge of having to become increasingly complex or even vulnerable to compromise. The recording of data streams and the use of store now - decrypt later attacks already pose a threat to the security of sensitive data today.

A new, promising approach involves physical keys generated by quantum mechanical effects. Quantum key distribution (QKD) enables the secure exchange of information using physically measurable methods. The presentation provides insight into the development of a start-up, from a flight model of an entangled photon-pair source and the spin-off from the academic environment, the founding of a deep-tech company, to the development of entanglement-based key distribution systems and their integration into complex IT networks. Finally, there is a brief insight into current implementations, architectures, and lessons-learned while rolling out the technology.

Keywords: Quantum Communication; Post Quantum Security; Entanglement; Quantum Technologies