Bidirectional state transfer between superconducting and microwave-photon qubits by single reflection
（May 5, 2024）
Abstract
The number of superconducting qubits contained in a single quantum processor is increasing steadily. However, to realize a truly useful quantum computer, it is inevitable to increase the number of qubits much further by distributing quantum information among distant processors using flying qubits. A key element towards this goal is a deterministic quantum interaction between superconducting-atom and propagating microwave-photon qubits. Here, we confirm the bidirectional state transfer between them, which completes by simply reflecting the photon at the atom. The averaged fidelity of the photon-to-atom (atom-to-photon) state transfer reaches 0.826 (0.801), limited mainly by the lifetime of the atom qubit. The present technology would be useful for future distributed quantum computation with superconducting qubits.
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Novel Microwave Isolator Points the Way to New Radio Cameras and Quantum Computers
（July 4, 2023）
Researchers at the National Astronomical Observatory of Japan (NAOJ) invented a novel microwave isolator and demonstrated for the first time its basic principle that enables small isolators that will be essential for future quantum computers. This isolator consists of two frequency mixers, which are widely used in receivers for radio telescopes, and paves the way for the development of large-scale multi-pixel radio cameras as well.
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Research group launches Japan’s third quantum computer at Osaka University
（December 20, 2023）
Quantum computer sources majority of components from Japanese makers
Tokyo and Osaka, December 20, 2023 – A consortium of joint research partners including the Center for Quantum Information and Quantum Biology at Osaka University, RIKEN, the Advanced Semiconductor Research Center at the National Institute of Advanced Industrial Science and Technology (AIST), the Superconducting ICT Laboratory at the National Institute of Information and Communications Technology (NICT), Amazon Web Services, e trees.Japan, Inc., Fujitsu Limited, NTT Corporation (NTT), QuEL, Inc., QunaSys Inc., and Systems Engineering Consultants Co.,LTD. (SEC) today announced the successful development of Japan’s third superconducting quantum computer (1) installed at Osaka University. Starting December 22, 2023, the partners will provide users in Japan access to the newly developed computer via the cloud, enabling researchers to execute quantum algorithms (2), improve and verify the operation of software, and explore use cases remotely.
The newly developed superconducting quantum computer uses a 64 qubit chip provided by RIKEN, which leverages the same design as the chip in RIKEN’s first superconducting quantum computer, which was unveiled to users in Japan as a cloud service for non commercial use on March 27, 2023 (3).
For the new quantum computer, the research team sourced more domestically manufactured components (excluding the refrigerator). The research team confirmed that the new quantum computer, including its components, provides sufficient performance and will utilize the computer as a test bed for components made in Japan.
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“The Moonshot 6 International Symposium 2023” took place at Akasaka Intercity Conference from July 18 to July 20. During the event, PM Tsuyoshi Yamamoto presented the project report in Session 3 “Superconductivity” on July 19. The session also featured talks from two renowned researchers, Dr. Opremcak from Google Inc. and Prof. Plourde from Syracuse University, both of whom were invited from abroad.
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Dr. Koji Inoue, Professor of the Graduate School and Faculty of information Scienceand Electrical Engineering, Kyusyu University and Director of the Quantum Computing System Center joined this project as a performer from February 2022.
Moonshot Goal 6 aims to realize an error-tolerant general-purpose quantum computer that will dramatically advance the economy, industry, and national security by 2050.
We held an international symposium for many people from industry and universities who are interested in international collaboration with this goal and its R&D projects.
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