Realization of a logical GKP ququart. Credit: Nature (2025). DOI: https://doi.org/10.1038/s41586-025-08899-y In the world of quantum computing, the Hilbert space dimension—the measure of the number of quantum states that a quantum computer can access—is a prized possession. Having a larger Hilbert space allows for more complex quantum operations and plays a crucial role in enabling quantum error correction (QEC), essential for protecting quantum information from noise and errors. A recent study ...