SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Quantum Communication (joint session QI/Q)
Q 34.5: Talk
Wednesday, March 8, 2023, 15:45–16:00, B305
Towards consumer-level quantum-secure cryptography - Entanglement based short-range Quantum Key Distribution — •Henning Mollenhauer1, Daniel Tippel1, Pius Gerisch1, Donika Imeri1,2, and Ralf Riedinger1,2 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, 22761 Hamburg — 2The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg
Many schemes for Quantum Key Distribution (QKD) have been proposed and realized over the years. A common challenge that arises in experimental implementations is the exponential loss of photons in quantum channels over long distances. Solutions to this challenge like purification protocols with quantum repeaters have not to date been efficiently implemented. A different approach to QKD is the key distribution over a short distance- and therefore low-loss- quantum channel. QKD over short distances can be used to exchange an information-theoretically secure root-of-trust that is safely stored on two end modules. Based on the root-of-trust, keys for encryption are generated in re-keying schemes on each end module. With this approach, it is possible to spatially separate the end modules and communicate classically over already existing communication infrastructure. Since no quantum channel is involved in the actual process of communication, encrypted messages can be sent between end modules over arbitrary distances. We here present an experimental setup that aims to realize short-distance QKD with end modules that in the future could be made compact enough to be implemented on small silicone-based chips.