Succeeded in developing the world’s fastest quantum simulator with 36 qubits using “Tomitake” supercomputer technology: Fujitsu


March 30, 2022
Fujitsu Limited

Accelerate application development by keeping an eye on the practical application of quantum computers

We recently announced the “A64FX” CPU of the “Tomitake” supercomputer.(Note 1)“FUJITSU PRIMEHPC FX700 supercomputer” equipped withFootnote 2hereafter “PRIMEHPC FX700”), we have developed the world’s fastest quantum computer simulator (hereafter, quantum simulator) which can handle 36-qubit quantum circuits on a cluster system.

This quantum simulator is the “Qulacs” quantum simulation software.(Note 3)Is a major quantum simulator of other institutions in 36-qubit quantum operation by enabling high-speed parallel and distributed execution.(Note 4)It has achieved about twice the performance of the above, and it will be possible to develop quantum computing applications that should be put into practice in the coming decades.

In response to this, from April 1, 2022, FUJIFILM Corporation (Note 5hereinafter, Fujifilm) will initiate research on the applications of quantum computing (hereinafter, quantum applications) in the field of materials.

In the future, we will develop a 40-qubit simulator by September 2022, promote research and development of quantum applications in collaboration with customers in various fields such as finance and drug discovery, and put the quantum computer in practice. our efforts by keeping an eye on it.

Development context

While the development of quantum computers, which are expected to exponentially improve computing speed over classical computers, is urgently needed to solve complex social problems, the current situation is that the error rate in hardware calculations is high. , and it is said that the realization of a practical quantum computer will take several decades. Therefore, attention is focused on quantum simulators that run on classical computers, and this is expected to accelerate the development of applications that can be used on quantum computers.

About the Developed Quantum Simulator

We have developed a parallel distributed quantum simulator that runs on a cluster system consisting of 64 nodes of our “PRIME HPC FX700” supercomputer. The “PRIME HPC FX700” is equipped with the “A64FX” processor of the “Tomitake” supercomputer, and can calculate the theoretical peak performance of 3,072 teraflops (hereinafter, TFLOPS) by double-precision floating-point arithmetic. In addition, it is equipped with 32 GB of memory with a large bandwidth of 1024 gigabytes (GB) per second, and “InfiniBand” between each node.(Note 6)12.5 GB per second high-speed communication is possible by connecting with it.

The quantum simulation software includes Osaka University, a national university society.(Note 7)And QunaSys Co., Ltd.(Note 8)SVE (Scalable Vector Extension) instruction when porting to “A64FX” by adopting the world’s fastest “Qulacs” level developed by(Note 9)By using to run multiple calculations at the same time, memory bandwidth performance was maximized. Additionally, MPI (Message Passing Interface)(Note 10)As a result, “Qulacs” can be executed in parallel and distributed, and data transfer that maximizes network bandwidth is achieved by overlapping computation and communication. Moreover, we have developed a new method to efficiently rearrange the state information of the qubits deployed in the distributed memory on the cluster according to the advancement of the quantum circuit and its computation, and reduce the communication cost. This method can also be applied to other quantum simulation software than “Qulacs”. As a result, as a 36-qubit quantum simulator, we have achieved about twice the performance of leading quantum simulators developed by other institutions and achieved the fastest processing speed in the world.

This time, this quantum simulator is used as “Qiskit”, which is one of the main development tools for quantum computer software (hereinafter referred to as “quantum software”).(Note 11)We have also prepared a very convenient development environment for quantum software developers. In addition, a partnership with QunaSys(Note 12)In the future, the quantum chemistry calculation software “Qamuy” provided by the company on this quantum simulator(Note 13)By making it available, we aim to perform a wide variety of high-speed quantum chemical calculations.

About joint research with Fujifilm

We will initiate joint research with FUJIFILM on quantum applications in the field of computational chemistry with the aim of developing innovative materials design methods. In the joint research, we will investigate and evaluate quantum computing-specific algorithms using this quantum simulator in calculating the chemical reactions of molecules.

·period From April 1, 2022 to March 31, 2023
·Goal Use of quantum computing technology in the field of computational chemistry
research content Examination and evaluation of algorithms specific to quantum computing in the chemical reactions of molecules
Distribution of roles [富士通] Provide a quantum simulator, consider the results of calculations and examine improvement methods
[富士フイルム様] Implementation of the quantum chemistry calculation, taking into account the calculation results and examining the improvement methods

Future prospects

To realize a larger-scale and faster quantum simulator, we will strengthen gate fusion technology that performs the operations of multiple quantum gates at once, and by September 2022, we will develop a 40-qubit quantum simulator. in areas such as finance and drug discovery. Additionally, we will apply the knowledge of quantum applications developed using quantum simulators to quantum computers in the future, aiming at the early realization of solutions to social problems using quantum computing technology.

Commentary by Keisuke Fujii, Professor, Graduate School of Basic Engineering, National University Corporation, Osaka University

High-speed simulators using supercomputers are becoming increasingly important in the development of quantum software and quantum applications that bring out the performance of quantum computers. It is expected that the world’s fastest simulator developed by merging the technologies of “Qulacs”, which is used as open source software around the world, and the supercomputer “Tomitake” will greatly accelerate the development of quantum software with an eye on the future.

Commentary by Mr. Yukihiro Okuno, Senior Researcher, Analytical Technology Center, FUJIFILM Corporation

Quantum computers have the potential to perform very precise calculations that were not possible with conventional computers in the field of computational chemistry. FUJIFILM will continue this joint research as part of a feasibility study on the use of quantum computers for materials development.

Comments by Vivek Mahajan, Managing Director and Senior Managing Director, Fujitsu Limited

We have successfully developed the world’s fastest quantum simulator by applying computer technology cultivated through the development of the “Tomitake” supercomputer. In the future, we aim to accelerate the development of quantum applications and contribute to a sustainable world by solving various problems by making our customers use this quantum simulator.

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