Responding to growing challenges that quantum computing presents to critical infrastructure (CI) security, this publication presents a Cybersecurity Reference Model for Operating Technology (MoRCiTO), designed to address the impending cyber threats of the quantum era and prevent network attacks on Cyber-Physical Systems (CPS) in CI. The model is the result of a comprehensive review of primary studies addressing aspects such as current and emerging threats that quantum computers pose against traditional cryptographic systems. By characterizing these threats, the model is tailored to provide an effective response to the risks associated with quantum computing. This research contributes significantly to the field of cybersecurity by providing a reference model aligned with future technological challenges. It represents a crucial step towards preparing and strengthening CIs against advanced cyber threats, establishing a solid foundation for future research in quantum cybersecurity. In addition, the model can be adopted by government entities and organizations responsible for CI management, with the aim of strengthening their resilience and responsiveness to potential quantum attacks. Its implementation will help ensure operational continuity and the protection of vital systems, helping to maintain the integrity and security of essential services in a threat environment that is constantly evolving due to technological advances.