Fujitsu achieves significant technical milestone with world’s fastest 36-qubit quantum simulator


The new simulator uses the same CPU at the heart of the world’s fastest supercomputer, Fugaku

TOKYO, March 30, 2022 — (JCN Newswire) — Fujitsu has successfully developed the world’s fastest quantum computer simulator capable of running 36 qubit quantum circuits on a clustered system with Fujitsu’s “FUJITSU Supercomputer PRIMEHPC FX 700” (“PRIMEHPC FX 700”) to handle. 1) equipped with the same A64FX CPU(2) that powers the world’s fastest supercomputer, Fugaku.

The newly developed quantum simulator can run the quantum simulator software “Qulacs”(3) in parallel at high speed, and achieves about twice the performance of other major quantum simulators(4) in 36-qubit quantum operations. Fujitsu’s new quantum simulator will serve as an important bridge to the development of quantum computing applications that are expected to be put into practice in the coming years.

Based on this breakthrough, Fujitsu and Fujifilm Corporation(5) (hereafter Fujifilm) will start joint research on quantum computing applications in the field of materials science from April 1, 2022.

Going forward, Fujitsu will accelerate its quantum computer development efforts with the goal of developing a 40-qubit simulator by September 2022, and conduct research and development of quantum applications together with customers in fields such as finance and drug discovery.

Vivek Mahajan, Corporate Executive Officer, CTO, Fujitsu Limited comments: “We are now on the brink of a new age in computing technology. Fujitsu has successfully developed the world’s fastest quantum simulator by using its world-leading expertise in computing technologies, cultivated over years Many decades ago, we used this knowledge to collaborate with RIKEN to develop the supercomputer Fugaku, which was used in was the fastest in the world for the past two years.In the future, we aim to use this new quantum simulator for our customers to develop quantum applications and ultimately contribute to a sustainable world by solving a range of problems society is facing .”

The new 36-qubit quantum simulator offers the world’s fastest processing speed
Fujitsu has developed a parallel and distributed quantum simulator for a cluster system consisting of 64 nodes on Fujitsu’s PRIMEHPC FX 700.

Equipped with the same A64FX CPU that powers the Fugaku supercomputer, the PRIMEHPC FX 700 is capable of a theoretical peak performance of 3,072 teraflops (TFLOPS) in double-precision floating-point format calculations. It also features 32 GB of storage with high bandwidth of 1,024 gigabytes (GB) per second and speeds of 12.5 GB per second by connecting nodes via InfiniBand(6).

The new quantum simulator uses “Qulacs”, one of the world’s fastest quantum simulator software developed by Osaka University(7) and QunaSys Corporation(8), and memory bandwidth performance has been maximized by performing multiple calculations simultaneously with SVE (Scalable Vector Extension ) instructions(9) were executed when ported to the A64FX.

MPI (Message Passing Interface)(10) enables Qulacs to run in parallel and in a distributed manner, realizing data transfer that maximizes network bandwidth by overlapping computation and communication. Fujitsu has developed a new method to efficiently rearrange the qubit states provided in the distributed memory on the cluster according to the progress of the quantum circuit and its calculation, which helps to reduce communication costs. In addition to “Qulacs”, the new system is also compatible with other quantum simulator software.

Qiskit(11), one of the key quantum computing software development tools, is available for Fujitsu’s quantum simulator, providing quantum software developers with a highly convenient development environment. In cooperation with QunaSys(12), Fujitsu plans to deploy the company’s Qamuy(13) quantum chemical calculation software on the new quantum simulator to provide the resources to execute a variety of high-speed quantum chemical calculations.

Outline of the joint research project with Fujifilm

In addition, Fujitsu and Fujifilm will start joint research on quantum applications in computational chemistry to realize innovative material design methods. The joint research will use Fujitsu’s newly developed quantum simulator to study and evaluate algorithms
specific to quantum computing in molecular chemical reaction calculations.

1. Period: April 1, 2022 to March 31, 2023

2. Purpose: Use of quantum computing technology in computational chemistry

3. Research content: Investigation and evaluation of quantum computing-specific algorithms in chemical reactions of molecules, etc.

4. Roles and Responsibilities:
– Provision of the quantum simulator, analysis of the calculation results and testing of improvement methods
– Performing quantum chemical calculations, analyzing calculation results and investigating improvement methods

future plans

In the future, Fujitsu will work to improve its technologies, including its quantum gate fusion technology capable of performing calculations for multiple quantum gates simultaneously, to realize quantum simulators on a larger scale and at higher speeds. Fujitsu also aims to develop a 40-qubit simulator for applications in finance and drug discovery by September 2022. Fujitsu will bring its accumulated knowledge of quantum applications developed on quantum simulators to the development of quantum computers to achieve early solutions to social issues with quantum technology.

Comment by Prof. Keisuke Fujii, Division of Advanced Electronics and Optical Science, Graduate School of Engineering Science, Osaka University:

High-speed supercomputer simulators are of increasing importance in the development of quantum software and quantum applications on which the performance of quantum computers depends. Qulacs, an open-source software used by developers worldwide, and the technology at the heart of the supercomputer “Fugaku” have been combined to create the world’s fastest quantum simulator, which we believe will power the future development of Quantum software will accelerate significantly.

Commentary by Yukihiro Okuno, Senior Researcher, Analysis Technology Center, Fujifilm:
Quantum computers have the potential to perform highly accurate calculations in computational chemistry that cannot be performed by classical computers. Fujifilm will conduct this joint research as a feasibility study on the use of quantum computing in materials science.

(1) PRIMEHPC FX 700: Supercomputer manufactured by Fujitsu using high-performance ARM architecture equipped with CPU A64FX used in supercomputer “Fugaku”.
(2) A64FX: The world’s first processor to implement the Scalable Vector Extension (SVE), an extension of the ARMv8.2-A instruction set architecture for supercomputers. It has 48 cores and delivers a maximum theoretical peak performance of 3.3792 TFLOPS for double precision floating point calculations. In addition, single-precision/semi-precision floating-point arithmetic and 8-bit/16-bit integer arithmetic can be performed with high throughput by 512-bit wide SIMD, which is very effective in AI and other processing .
(3) Qulacs: open source quantum circuit simulator software mainly developed by Fujii Laboratory, Graduate School of Engineering Science, Osaka University; Development of new features and maintenance by QunaSys. (Paper)
(4) Other large quantum simulators: Intel Quantum Simulator (Intel-QS), “JUQCS” by Forschungszentrum Jülich, Qiskit-Aer by IBM
(5) Fujifilm Corporation: Headquarters: Minato-ku, Tokyo, Japan; President and CEO: Teiichi Goto.
(6) Infiniband: A network used primarily in supercomputers to connect servers. Used to provide a bi-directional serial link communication system capable of realizing a high-speed band by using a plurality of channels in a bundle.
(7) Osaka University: Location: Suita City, Osaka Prefecture, Japan; Chairman: Shojiro Nishio.
(8) QunaSys Co., Ltd.: Headquarters: Bunkyo-ku, Tokyo, Japan; Managing Director: Tien Yang.
(9) SVE (Scalable Vector Extension) instruction: A CPU instruction that performs multiple operations in parallel with a single instruction.
(10) MPI (Message Passing Interface): Communications API describing communication processing to achieve parallel processing on a supercomputer.
(11) Qiskit: Quantum software development tool developed by IBM and released as open source.
(12) Partnership with QunaSys: “Quantum Computer Venture QunaSys Raises $1.24 Billion Series B” (QuunaSys press release dated March 28, 2022)
(13) Qamuy: Quantum chemical calculation software provided by QunaSys. The quantum chemical calculation input is translated into a quantum circuit, and the calculation can be performed seamlessly on a simulator or an actual machine.

About Fujitsu

Fujitsu is the leading Japanese information and communication technology (ICT) company offering a full range of technology products, solutions and services. Around 126,000 Fujitsu employees support customers in more than 100 countries. We use our experience and the power of ICT to shape the future of society with our customers. Fujitsu Limited (TSE:6702) reported consolidated sales of 3.6 trillion yen (US$34 billion) for the year ended March 31, 2021. Visit for more information.

Source: Fujitsu Ltd

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