In summary, quantum hardware is a rapidly evolving field, with ongoing research and development aimed at building more powerful and practical quantum computers. As of my last knowledge update in September 2021, quantum hardware remains an area of active exploration, and advancements continue to be made in the development of more robust and scalable quantum computing systems.1
References
1Khang A. Driving transformative technology trends with quantum-based artificial intelligence applications. In: The Quantum Evolution. CRC Press; 2024:75-100. doi:10.1201/9781032642079-4