Fujitsu, RIKEN aim for 1000 qbit quantum computer
Fujitsu and RIKEN in Japan have launched a 64 qubit superconducting quantum computer and are developing a 1000 qbit version.
The new quantum computer at the RIKEN RQC-Fujitsu Collaboration Centre will be used with a one of the world’s largest 40 qubit quantum computer simulators developed by Fujitsu running on a conventional supercomputer. Fujitsu and RIKEN are now providing the new platform to companies and research institutions that are conducting joint research with Fujitsu and RIKEN
The hybrid platform enables easy comparison of calculation results of noisy intermediate-scale quantum (NISQ) computers against error-free results from quantum simulators, contributing to accelerated research in areas including performance evaluation of error mitigation algorithms in quantum applications. The platform is implemented as a scalable cloud architecture by using cloud services such as serverless computing service AWS Lambda provided by Amazon Web Services.
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Fujitsu and RIKEN are further developing a hybrid quantum algorithm that links superconducting quantum computing with high-performance computing (HPC). By linking a quantum computer with a quantum simulator that runs on an HPC, Fujitsu and RIKEN have succeeded in developing a hybrid quantum algorithm that enables quantum chemistry calculations with greater accuracy than conventional algorithms.
Moving forward, Fujitsu and RIKEN will promote the development of technologies including high-density implementation to realize a 1,000 qubit superconducting quantum computer, as well as technologies to achieve more precise quantum gate operations.
The quantum computer includes an integrated 64 superconducting qubit chip with a vertical wiring scheme, making it scalable for future expansion to the 1000 qbit design. It uses qbit control software built by NTT to achieve high-precision control of qbits, enabling calculations of ideally up to 2 64 quantum superposition and entanglement states, which is expected to enable calculations on a scale that have been difficult to achieve with classical computers.
Fujitsu and RIKEN will further provide quantum computing and quantum simulation resources to customers for applications in various fields including finance and drug discovery through this platform and promote R&D activities for quantum applications through joint research to accelerate the practical application of both quantum computing hardware and software.
Quantum simulators, which can digitally imitate quantum computation, provide a vital bridge toward the development of practical, fault-tolerant quantum computing. Unlike current quantum computers, quantum simulators can perform error-free and long-step (quantum-like) computations as they do not rely on error-prone qubits.
However, as quantum simulators only digitally reproduce quantum computation on classical computers, they cannot realize actual quantum acceleration, an expected benefit of practical quantum computers.
Fujitsu and RIKEN are further developing hybrid quantum algorithms that link quantum computing and HPC to contribute to the solution of problems in various industries. As part of their current joint research, the two parties have developed a hybrid quantum algorithm in which a quantum simulator performs part of the calculation of an algorithm for a quantum computer.
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The algorithm enables the calculation of large molecules with high accuracy using quantum algorithms and Density Matrix Embedding Theory (DMET), a quantum chemistry calculation method to divide large molecules into multiple small fragments. Fujitsu and RIKEN applied this algorithm to the calculation of the ground state energy of the H12 molecule (a chain molecule consisting of twelve hydrogen atoms) and combined it with AI-based quantum computation correction technology to mitigate the effects of noise in quantum computers. In this way, Fujitsu and RIKEN for the first time confirmed that energy calculations can be performed with higher accuracy than existing classical algorithms.
In addition to providing this technology on the new hybrid quantum computing platform in the future, Fujitsu will further work toward the realization of a computing workload broker, an AI-based software that automatically selects from different computing resources and algorithms to offer the optimal solution to customers’ problems.
Fujitsu has been conducting joint research with Fujifilm, Tokyo Electron and Mitsubishi Chemical on the development of pioneering quantum applications using quantum simulators.
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