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Q: Fachverband Quantenoptik und Photonik

Q 20: QuanTour II – Multi-photon Effects & Entanglement

Q 20.7: Talk

Tuesday, March 3, 2026, 12:45–13:00, P 7

Single photons for quantum position verification — Kirsten Kanneworff, Mio Poortvliet, Petr Steindl, and •Wolfgang Löffler — Leiden Institute of Physics, Leiden, the Netherlands

We show our progress towards experimental demonstration of quantum position verification using demultiplexed photons from a quantum dot - microcavity single photon source. Quantum position verification is a future quantum network application where the geographic location enables remote authentication of a party, without the need that the parties exchange private keys physically. This remote position verification cannot be done classically and might provide a clear quantum advantage - based on combining the speed of light limit of special relativity with the quantum no-cloning principle. We implement a loss-tolerant protocol with photons produced in a semiconductor quantum dot - cavity system that undergo Hong-Ou-Mandel quantum interference at the location to be verified. We show our lab demo experiment, and discuss challenges for future implementations of quantum position verification in quantum networks.

Keywords: quantum dot cavity-QED; position-based cryptography; quuntum position verification; quantum networks