Singlet fission can generate an exchange-coupled quintet triplet pair state 5TT, which could lead to the realization of quantum computing and quantum sensing using entangled multiple qubits even at room temperature. However, the observation of the quantum coherence of 5TT has been limited to cryogenic temperatures, and the fundamental question is what kind of material design will enable its room-temperature quantum coherence. 

In a groundbreaking study, researchers have discovered a method to achieve room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework. Singlet fission, a process that can create an exchange-coupled quintet triplet pair state known as 5TT, has the potential to revolutionize quantum computing and quantum sensing by enabling the use of entangled multiple qubits even at room temperature. Despite the immense potential of 5TT, its quantum coherence has previously only been observed at cryogenic temperatures, posing a significant limitation. This study raises the fundamental question of how material design can enable room-temperature quantum coherence of 5TT, offering new insights and possibilities in the field of quantum information processing. The findings open up exciting avenues for further research and development in the quest for practical quantum technologies. Further details on this groundbreaking research can be found at the following URL: https://www.science.org/doi/10.1126/sciadv.adi3147

Room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework