Exciton science sits at the intersection of chemical, optical and spin-based implementations of information processing, but using excitons to conduct logical operations remains relatively unexplored. Excitons encoding information could be read optically (photoexcitation–photoemission) or electrically (charge recombination–separation), travel through materials via exciton energy transfer, and interact with one another in stimuli-responsive molecular excitonic devices. Excitonic logic offers the potential to mediate electrical, optical and chemical information. Additionally, high-spin triplet and quintet (multi)excitons offer access to well defined spin states of relevance to magnetic field effects, classical spintronics and spin-based quantum information science. In this Roadmap, we propose a framework for developing excitonic computing based on singlet fission (SF) and triplet–triplet annihilation (TTA). Various molecular components capable of modulating SF/TTA for logical operations are suggested, including molecular photo-switching and multi-colour photoexcitation. We then outline a pathway for constructing excitonic logic devices, considering aspects of circuit assembly, logical operation synchronization, and exciton transport and amplification. Promising future directions and challenges are identified, and the potential for realizing excitonic computing in the near future is discussed.

激子科学位于化学、光学和基于自旋的信息处理实现的交叉点，但使用激子进行逻辑运算仍然相对未经探索。编码信息的激子可以光学（光激发-光发射）或电学（电荷重组-分离）方式读取，通过激子能量转移穿过材料，并在刺激响应分子激子装置中相互相互作用。激子逻辑提供了介导电、光和化学信息的潜力。此外，高自旋三重态和五重态（多）激子提供了与磁场效应、经典自旋电子学和基于自旋的量子信息科学相关的明确自旋态。在本路线图中，我们提出了一个基于单线态裂变（SF）和三线态-三线态湮灭（TTA）的激子计算框架。建议使用能够调节 SF/TTA 进行逻辑运算的各种分子组件，包括分子光开关和多色光激发。然后，我们概述了构建激子逻辑器件的途径，考虑了电路组装、逻辑操作同步以及激子传输和放大等方面。确定了有前途的未来方向和挑战，并讨论了在不久的将来实现激子计算的潜力。