Sprecher
Beschreibung
Certifying quantum behavior from classically accessible data is essential for secure communication and scalable quantum technologies. While powerful certification methods such as Bell nonlocality and quantum steering exist, their implementation typically requires entanglement or additional assumptions, and experimental demonstrations mainly focus on low-dimensional systems. In minimal prepare-and-measure scenarios [1], where a sender encodes information into quantum states and a receiver performs a single measurement, robust certification becomes particularly challenging, especially in the presence of noise and in higher-dimensional Hilbert spaces. In this talk, we will present a recent theory-experiment work [2] where we propose, design, and experimentally implement a protocol that certifies quantumness between two distant parties without the need for preshared resources or measurement incompatibility. The experiment is carried out using the orbital angular momentum degrees of freedom of single photons, chosen for increased dimensionality that is scalable. We demonstrate the robustness of the protocol through rank‑stability analysis of the observed correlations, which enables the certification of non‑classicality even in the presence of noise. These results provide a practical route to validate high-dimensional quantum communication systems and open new possibilities for secure and dimension-efficient quantum information processing. More broadly, this talk will also cover the basics and existing challenges of certification via communication, and the recent advances in the field.
[1] Background, theory and current limitations in certification via communication: https://arxiv.org/abs/2308.07727, https://arxiv.org/abs/2303.06990.
[2] Main work to be presented (high-dimensional protocol + experiment): https://arxiv.org/abs/2605.04338