RIKEN’s new platform for quantum-HPC hybrid computing, dubbed the JHPC-quantum GPU supercomputer “ROQUO”, has gone into operation. The new system, installed on RIKEN’s Kobe campus, was developed primarily by the RIKEN Center for Computational Science (R-CCS) and built mainly by DTS Corporation. It was introduced as part of the NEDO-commissioned project "Research and Development of Quantum-Supercomputers Hybrid Platform for Exploration of Uncharted Computable Capabilities" (JHPC-quantum). The scientific goals of the new system are principally to enhance quantum-computing simulation environments on supercomputers and accelerate quantum-algorithm development and performance evaluation; demonstrate the feasibility of quantum-HPC hybrid computing through tightly coupled integration with R-CCS’s supercomputer Fugaku, the IBM Quantum System Two (“ibm_kobe”) and the Quantinuum trapped-ion quantum computer “Reimei"; pioneer new application areas that combine quantum computers and GPUs, such as quantum machine learning, and responding flexibly to advanced computational needs that are difficult to meet with Fugaku alone. For more information, see the article on the R-CCS website.