The urgent challenges of global climate change and the objectives of the Paris Agreement highlight the critical role of low-carbon energy technologies. This article examines Quantum Internet of Things (QIoT) technologies-particularly quantum sensing, quantum computing, and quantum communication-within the framework of the low-carbon energy sector. These technologies significantly enhance energy efficiency and security. Quantum sensing enhances resource utilization and system intelligence through precise monitoring. Quantum computing tackles complex data processing and optimization problems, while quantum communication enhances the security, efficiency, and incorporation of renewable energy sources within the energy grid, supporting the shift to a low-carbon energy system. Future research could focus on the development of compact quantum devices, the establishment of interoperability standards, cost reduction, and the enhancement of quantum encryption for low-carbon QIoT energy systems. Additionally, future research could explore the potential of quantum computing in enhancing energy trading optimization and conducting risk assessments of the energy industry chain, thereby improving energy market efficiency.