QScratch: introduction to quantum mechanics concepts through block-based programming Daniel Escanez-Exposito, Marcos Rodriguez-Vega, Carlos Rosa-Remedios and Pino Caballero-Gil EPJ Quantum Technol., 12 1 (2025) 12 Published online: 27 January 2025 DOI: 10.1140/epjqt/s40507-025-00314-9