Fujitsu Announces 36 Qubit Quantum Simulator

“High-speed simulators using supercomputers are of ever-increasing importance in the development of the quantum software and quantum applications on which the performance of quantum computers depends,” said Prof. Keisuke Fujii, Division of Advanced Electronics and Optical Science, Graduate School of Engineering Science, Osaka University.

Photo Vivek Mahajan, CEO and CTO at Fujitsu

“We aim to leverage this new quantum simulator for our customers to accelerate the development of quantum applications,” said Vivek Mahajan, CEO and CTO at Fujitsu.Fujitsu has successfully developed one of the fastest quantum computer simulators. Their quantum computer simulator would be capable of handling 36 qubit quantum circuits on a cluster system using Fujitsu’s ‘FUJITSU Supercomputer PRIMEHPC FX 700.’ PRIMEHPC FX 700 is powered by the same A64FX CPU as the world’s fastest supercomputer, Fugaku.

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In 36 qubit quantum operations, the newly designed quantum simulator can execute the quantum simulator software ‘Qulacs’ in parallel at high speed, delivering almost double the performance of other notable quantum simulators. Fujitsu’s new quantum simulator would be a crucial step toward the development of quantum computing applications, which are expected to be implemented in the coming years.

Fujitsu and Fujifilm will begin cooperation research on quantum computing applications in the realm of materials science on April 1, 2022, based on this accomplishment.

Fujitsu’s efforts to construct quantum computers will be accelerated in the future, with the goal of developing a 40 qubit simulator by September 2022, as well as conducting cooperative research and development of quantum applications with clients in industries such as finance and drug discovery.

“We stand now at the edge of a new age in computing technology,” said Vivek Mahajan, Corporate Executive Officer, CTO, Fujitsu. “Fujitsu has successfully developed the world’s fastest quantum simulator by applying its world-leading expertise in computing technologies cultivated over many decades – most recently we put this knowledge to use to work with RIKEN to design the supercomputer Fugaku, which has remained the world’s fastest for the past two years. Moving forward, we aim to leverage this new quantum simulator for our customers to accelerate the development of quantum applications and ultimately contribute to a sustainable world by solving a range of issues facing society.”

Qulacs, Qiskit

On Fujitsu’s PRIMEHPC FX 700, Fujitsu has built a parallel and distributed quantum simulator for a cluster system with 64 nodes.

The PRIMEHPC FX 700 is powered by the same A64FX CPU as the supercomputer Fugaku, and it can calculate in double-precision floating-point format at a potential peak speed of 3.072 teraflops (TFLOPS). It also has 32 GB of memory, a high bandwidth of 1,024 gigabytes (GB) per second, and rates of 12.5 GB per second when using InfiniBand to link nodes.

When ported to the A64FX, the new quantum simulator uses ‘Qulacs,’ one of the world’s fastest quantum simulator software developed by Osaka University and QunaSys Corporation, and memory bandwidth performance was optimized by executing multiple calculations simultaneously using SVE (Scalable Vector Extension) instructions.

“High-speed simulators using supercomputers are of ever-increasing importance in the development of the quantum software and quantum applications on which the performance of quantum computers depends,” said Prof. Keisuke Fujii, Division of Advanced Electronics and Optical Science, Graduate School of Engineering Science, Osaka University. “Qulacs, an open source software used by developers worldwide, and the technology at the heart of the supercomputer ‘Fugaku,’ have been combined to realize the world’s fastest quantum simulator, which we are confident will greatly accelerate the future development of quantum software.”

Message Passing Interface

By overlapping computation and transmission, MPI (Message Passing Interface) enables parallel and distributed Qulacs execution and accomplishes a data transfer that maximizes network capacity. Fujitsu has also created a novel approach for effectively rearranging the qubit states deployed in the cluster’s distributed memory based on the progress of the quantum circuit and its computation, which helps to cut communication costs. Aside from ‘Qulacs,’ the new technology is interoperable with other quantum simulator software.

Qiskit, one of the most popular development tools for quantum computer software, is now accessible for Fujitsu’s quantum simulator, providing an easy working environment for quantum software developers. Fujitsu wants to put its quantum chemical calculation software Qamuy on the new quantum simulator in collaboration with QunaSys to give the resources to conduct a wide range of high-speed quantum chemical calculations.

Joint Research Project with Fujifilm, Future Plans

Furthermore, Fujitsu and Fujifilm will collaborate on quantum applications in computational chemistry to develop novel material design methodologies. Fujitsu’s newly created quantum simulator will be used in the collaborative research to examine and evaluate quantum computing methods in molecular chemical reaction computations.

Fujitsu will continue to expand its technologies, such as its quantum gate fusion technology, which can execute calculations for many quantum gates at the same time, allowing quantum simulators to be realized on a wider scale and at faster rates.

Fujitsu also plans to release a 40-qubit simulator in September 2022, with applications in finance and drug development. Fujitsu will use its experience developing quantum applications on quantum simulators to help create quantum computers, with the goal of finding early answers to societal problems utilizing quantum technology.

“Quantum computers have the potential to perform highly accurate calculations in the computational chemistry field, which cannot be performed by classical computers,” said Yukihiro Okuno, Senior Researcher, Analysis Technology Center, Fujifilm. Fujifilm will conduct this joint research as a feasibility study to utilize quantum computers in material sciences.”