The research field of quantum biology has been rapidly developing in recent years. In order to realize quantum sensing, it is necessary to develop technologies to understand several biological phenomena from the quantum information in fluidic environments through the quantum measurements 10 using safe wavelengths and weak light, and to apply this to diagnostic and therapeutic applications. Although the electron spins are sensitive to environmental fluctuations, the spin states may exhibit quantum coherence as exemplified by the nitrogen-vacancy (NV) centers found in diamond defects. However, the question of how to control quantum states in a noisy room-temperature environment to achieve practical quantum sensing remains unexplored in condensed matter systems. The photoexcited state of a supramolecule consisting of a chromophore coupled with a radical gives rise to various spin states (excited quartet, excited doublet, and ground doublet) depending on the properties of the electronic orbitals. This is expected to lead to the development of quantum information science, spintronics, and dynamic nuclear polarization (DNP), which can be utilized for a wide variety of the next generation quantum technologies including the medical applications. Molecular materials have many advantages over mesoscopic solid-state materials, such as the ability to achieve structural reproducibility and modularity with atomic-level precision.