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Synopsis

Quantum technologies are transitioning from laboratory demonstrations to components that must coexist with large‑scale telecommunication infrastructure. This seminar presents a system‑level examination of quantum technologies in modern optical networks, with a particular focus on quantum key distribution (QKD), post‑quantum cryptography (PQC), and the emerging role of quantum computing in network optimization.

We examine the physical and engineering constraints that govern real‑world deployment, including fiber loss, polarization mode dispersion, quantum–classical channel coexistence, finite‑key effects, and performance characterization under operational conditions. Rather than idealized limits, the discussion emphasizes effective key rates, composable security, and integration challenges in meshed, high‑capacity networks.

The talk also explores the limits of current quantum computing approaches for traffic engineering and optimization, highlighting where quantum methods may eventually complement classical techniques—and where no clear advantage yet exists. The seminar concludes with a holistic view of quantum technologies as part of a broader networked system, underscoring the need for interdisciplinary collaboration between physics, engineering, and applied cryptography.