Fujitsu and Osaka University develop new quantum computing architecture, accelerating progress toward practical application of quantum computers : Fujitsu Global

2023-03-23 15:27:57 By : Ms. Ada chen

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Fujitsu and Osaka University’s Center for Quantum Information and Quantum Biology (QIQB) today revealed the development of a new, highly efficient analog rotation quantum computing architecture, representing a significant milestone toward the realization of practical quantum computing. The new architecture reduces the number of physical qubits required for quantum error correction – a prerequisite for the realization of fault-tolerant quantum computing – by 90% from 1 million to 10,000 qubits. This breakthrough will allow research to embark on the construction of a quantum computer with 10,000 physical qubits and 64 logical qubits (4), which corresponds to computing performance of approximately 100,000 times that of the peak performance of conventional high performance computers.

Moving forward, Fujitsu and Osaka University will further refine this new architecture to lead the development of quantum computers in the early FTQC era, with the aim of applying quantum computing applications to a wide range of practical societal issues including material development and finance.

Gate-based quantum computers are expected to revolutionize research in a wide range of fields including quantum chemistry and complex financial systems, as they will offer significantly higher calculation performance than current classical computers. Logical qubits, which consist of multiple physical qubits, play a major key role in quantum error correction technology, and ultimately the realization of practical quantum computers that can provide fault-tolerant results.

Within conventional quantum computing architectures, calculations are performed using a combination of four error-corrected universal quantum gates (5) (CNOT, H, S, and T gate). Within these architectures, especially quantum error correction for T-gates requires a large number of physical qubits, and rotation of the state vector in the quantum calculation requires repeated logical T-gate operations for approximately fifty times on average. Thus, the realization of a genuine fault-tolerant quantum computer is estimated to require more than one million physical qubits in total.

For this reason, quantum computers in the early FTQC era using conventional architecture for quantum error correction can only conduct calculations on a very limited scale below that of classical computers, as they work with a maximum of about 10,000 physical qubits, a number far below that required for genuine, fault-tolerant quantum computing.

To address these issues, Fujitsu and Osaka University developed a new, highly efficient analog rotation quantum computing architecture that is able to significantly reduce the number of physical qubits required for quantum error correction, and enable even quantum computers with 10,000 physical qubits to perform better than current classical computers, accelerating progress toward the realization of genuine, fault-tolerant quantum computing.

Fujitsu and Osaka University have been promoting joint R&D in quantum error correction technology including new quantum computation architectures for the early FTQC era at the “Fujitsu Quantum Computing Joint Research Division,” a collaborative research effort of the QIQB, established on October 1, 2021 at the campus of Osaka University as part of Fujitsu’s “Fujitsu Small Research Laboratory” program (6).

By redefining the universal quantum gate set, Fujitsu and Osaka University succeeded in implementing a phase rotating gate – a world first– which enables highly efficient phase rotation, a process which previously required a high number of physical qubits and quantum gate operations.

In contrast to conventional architectures that required repeated logical T-gate operations using a large number of physical qubits, gate operation within the new architecture is performed by phase rotating directly to any specified angle.

In this way, the two parties succeeded in reducing the number of qubits required for quantum error correction to around 10% of existing technologies, and the number of gate operations required for arbitrary rotation to approx. 5% of conventional architectures. In addition, Fujitsu and Osaka University suppressed quantum error probability in physical qubits to about 13%, thus achieving highly accurate calculations.

The newly developed computing architecture lays the foundation for the construction of a quantum computer with 10,000 physical qubits and 64 logical qubits, which corresponds to computing performance of approximately 100,000 times that of the peak performance of conventional high performance computers.

Research and development of the new quantum computing architecture was supported by the following programs: Japan Science and Technology Agency (JST), The program on open innovation platform for industry-academia co-creation (COI-NEXT), "Quantum Software Research Hub" (JPMJPF2014); JST Moonshot Goal 6 "Realization of a fault-tolerant universal quantum computer that will revolutionize economy, industry, and security by 2050", R&D project "Research and Development of Theory and Software for Fault-tolerant Quantum Computers" (JPMJMS2061); MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) "Development of quantum software by intelligent quantum system design and its applications" (JPMXS0120319794) and "Development of quantum software applications by fast classical simulator of quantum computers" (JPMXS0118067394).

Fujitsu’s purpose is to make the world more sustainable by building trust in society through innovation. As the digital transformation partner of choice for customers in over 100 countries, our 124,000 employees work to resolve some of the greatest challenges facing humanity. Our range of services and solutions draw on five key technologies: Computing, Networks, AI, Data & Security, and Converging Technologies, which we bring together to deliver sustainability transformation. Fujitsu Limited (TSE:6702) reported consolidated revenues of 3.6 trillion yen (US$32 billion) for the fiscal year ended March 31, 2022 and remains the top digital services company in Japan by market share. Find out more: www.fujitsu.com.

Osaka University was founded in 1931 as one of the seven imperial universities of Japan and is now one of Japan's leading comprehensive universities with a broad disciplinary spectrum. This strength is coupled with a singular drive for innovation that extends throughout the scientific process, from fundamental research to the creation of applied technology with positive economic impacts. Its commitment to innovation has been recognized in Japan and around the world, being named Japan's most innovative university in 2015 (Reuters 2015 Top 100) and one of the most innovative institutions in the world in 2017 (Innovative Universities and the Nature Index Innovation 2017). Now, Osaka University is leveraging its role as a Designated National University Corporation selected by the Ministry of Education, Culture, Sports, Science and Technology to contribute to innovation for human welfare, sustainable development of society, and social transformation. Website: https://resou.osaka-u.ac.jp/en

Fujitsu Limited Public and Investor Relations Division Inquiries

Osaka University International Advanced Research Institute, Center for Quantum Information and Quantum Biology COI-NEXT, Quantum Software Research Hub E-mail: coi-next@qiqb.osaka-u.ac.jp

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