Author: Annameng Ma

We are excited to announce our latest arXiv submission: “Certifying high-dimensional quantum channels” (https://arxiv.org/abs/2408.15880). High-dimensional quantum communication offers significant advantages like increased information capacity and enhanced noise resilience. But how do we reliably certify that a quantum channel can transmit this high-dimensional information?

In our paper, we introduce novel, efficient methods for characterizing the dimensionality of quantum channels. Using a prepare-and-measure setup, we develop certification witnesses for both fully and partially trusted scenarios. We apply these methods to a photonic experiment, successfully certifying dimensionalities up to 59 through a commercial graded-index multi-mode optical fiber. Additionally, we provide detailed numerical simulations that model the noise behaviour of the fiber and explore more advanced certification techniques.

Our work represents a key step towards robust, high-dimensional quantum communication systems. For more information, check out our full preprint!