Time-bin encoded photon pairs enable robust, decoherence-resistant transmission through optical fibers for long-distance quantum communication, where phase noise poses a critical limitation to stable operation. Here, we implement an adaptive Perturbation-and-Observe algorithm on a fully digital FPGA platform operating with real-time feedback at 1 Hz. The control signal is derived from the coincidence counts of correlated photon pairs. This adaptive approach reduces the rise time by 70\% and the coincidence noise by 30\%, resulting in visibility improvements sustained for more than 600 s.These results provide an efficient solution for long-term phase stabilization in quantum and photonic systems.
@article{arxiv.2510.23572,
title = {FPGA-Based Adaptive Control for Phase Stabilization in Fiber-Optic Interferometers Using Correlated Photons},
author = {P. M. Berto and F. CampodÓnico and A. A. Matoso and S. Vergara and P. A. Coelho and G. Lima and S. PÁdua and J. CariÑe},
journal= {arXiv preprint arXiv:2510.23572},
year = {2025}
}