Matthias Bereumann enhanced quantum simulation capabilities in the cda-tum/mqt-core repository by developing improved virtual gate handling and simulation workflows. He refactored the management of virtual operations, such as SWAP gates, and introduced a dedicated function for applying global phases, addressing both simulation accuracy and efficiency. Using C++ and leveraging his skills in algorithm implementation and quantum computing, Matthias also implemented a feasibility check to determine if operations could be executed virtually, reducing runtime errors and optimizing resource usage. His work provided a more robust foundation for scalable quantum circuit simulations, enabling faster experimentation and more reliable testing within the library.