A research group led by Professor Akira Furusawa has successfully generated the first optical Gottesman-Kitaev-Preskill (GKP) qubit, a logic qubit that can restore error information to its original state while retaining superposition in a single qubit. Professor Furusawa’s group and the National Institute of Information and Communications Technology (NICT) have succeeded in generating GKP qubits using a superconducting photon detector. It is expected to be combined with Professor Furusawa group’s technology for large-scale optical quantum processors to realize a large-scale error-tolerant optical quantum computer. In addition to NICT, RIKEN, universities in the Czech Republic and the Federal Republic of Germany also participated in this joint research. The resulting paper was published in the online edition of the scientific journal Science on January 19.