AffiliationNameNanotechnology and its applications to quantum information and electronicsMoonshotResearch&DevelopmentProgramMembersThe research of quantum computers has been very active during recent years. One of the reasons for the rapid progress is the improvement in coherence time of the qubit due to the advancement of nanotechnology. However, the current status of the quantum circuit has not yet attained its full implementation. We must accelerate the pace of research and development toward the truly fault-tolerant quantum computer.Fumiki YoshiharaJaw-Shen TsaiKaoru SanakaMark Paul SadgroveNoboru WatanabeYoichiro HashizumeHideaki TakayanagiShohei WatabeYasuhiko Arakawa Seigo TaruchaTsuyoshi YamamotoShiro SaitoJun’ichi SoneSahel ASHHABDirectorProfessor,Department of Physics, Faculty of Science Division IFumiki YoshiharaPh.D.Future Development Goals In recent years, demonstrations of quantum supremacy by Google and later the University of Science and Technology of China, the establishment of IBM’s commercial quantum computer, and the D-Wave System’s large quantum annealing machines, quantum information processing has made r e m a r k a b l e p r o g r e s s . A l l o f t h e a b o v e s y s t e m s a r e b a s e d o n superconducting qubits, but quantum computing systems based on other systems such as ions, cold atoms, semiconductors, and light are also being actively researched around the world. Our division mainly investigates the superconducting qubit. Qubit cause errors like ordinary classical semiconductor circuits. For example, malfunction of the qubit comes from the breakdown of the quantum superposition state. Such phenomenon is called decoherence. Even for the state-of-the-art superconducting qubit, its coherence time is still in the order of milli seconds. The fault-tolerant quantum computer would be realized by employing a quantum error correction procedure, and it would deliver truly practical applications. The division plans to carry out research of several kinds of fault-tolerant quantum circuits with superconducting qubits. It is expected that the fault-tolerant quantum computer would appear by 2050, and we would try to contribute to its realization. In this division, we have succeeded in developing a novel qubit called a superconducting bosonic qubit and have shown that it is a scalable quantum information processing platform. In the future, we are planning a demonstration experiment of quantum error correction using these qubits. Integrability and operability are the advantages of superconducting qubits, and its disadvantage, the short coherence time, has been significantly improved in recent years. Besides the superconducting qubit, qubits based on other physical systems, like photon, ion, cold atom and electron spin in quantum dot have been investigated. In our division, optical qubits are also being investigated, along with the superconducting qubits.FundamentalsTokyo University of ScienceBackgroundOurtargetsEstablished: April, 2025Our research division aims at optimization of the operation/readout condition for superconducting, and optical qubits.ObjectivesThis division will contribute to the practical realization of the quantum computer in 2050. fumiki@rs.tus.ac.jp The research subject “Developing bosonic code using superconducting resonator” was adopted to the government moonshot research & development program in 2020. The program leader is Prof. Tsai. Prof. Yoshihara, Takayanagi, Watabe, and Hashizume join this program. This program continues until 2025（https://ms-iscqc.jp).Tokyo University of ScienceTokyo University of Science Tokyo University of Science Tokyo University of Science Tokyo University of Science Tokyo University of Science The University of TokyoShibaura Institute of TechnologyThe University of TokyoRikenNECNTTJSTNICT32Division of Nano-quantum Information Science and Technology
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