Quantum Photo-Science Laboratory is a new laboratory founded at Apr. 2023. We are interested in the coherent behavior of multiple molecules in the condensed phase. Utilizing femtosecond ultrafast lasers and interferometric techniques, we will elucidate the ultrafast dynamics of such coherent systems. Right now, we are studying the novel properties of polaritonic states, which are produced by the coupling of quantum states of molecules and photons in a confined cavity, with the aim of elucidating their causes and creating new functions.