Randomness is fundamental for secure communication and information processing. While continuous-variable optical systems offer an attractive platform for this task, certifying genuine quantum randomness in such setups remains challenging. We present a semi-device-independent scheme for randomness certification tailored to continuous-variable implementations, where the dimension assumption is operationally implemented by restricting state preparations to the two-level Fock subspace. Using standard homodyne and displacement-based measurements, we show that simple optical setups can achieve dimension-witness violations that certify positive min-entropy, even in the presence of realistic losses and misaligned reference frames. These results demonstrate that practical and scalable quantum randomness generation is achievable with minimal experimental complexity on continuous-variable platforms.
@article{arxiv.2511.05672,
title = {Semi-device-independent randomness certification on discretized continuous-variable platforms},
author = {Moisés Alves and Vitor L. Sena and Santiago Zamora and Tailan S. Sarubi and A. de Oliveira Junior and Alexandre B. Tacla and Rafael Chaves},
journal= {arXiv preprint arXiv:2511.05672},
year = {2026}
}