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Tohoku University and NEC Corporation have started joint research on computer systems using an 8-qubit quantum annealing machine developed by NEC and Japan's National Institute of Advanced Industrial Science and Technology (AIST).

The 8-qubit quantum annealing machine used in this research has been newly developed using superconducting technology paired with ParityQC Architecture(*1). Owing to this, the machine is resistant to noise and remains capable of scaling up to a fully-connected quantum annealing architecture while maintaining a prolonged quantum superposition state.

This is the first domestically manufactured quantum annealing machine in Japan that is accessible from the outside via the Internet. This joint research is also the first project to use this machine.

Joint research using the newly developed 8-qubit quantum annealing machine

Solving complex social issues entails deriving optimal combinations from a large number of options (solution of combinatorial optimization problems). To solve combinatorial optimization problems at high speed and with high accuracy, NEC and AIST are developing a quantum annealing machine(*2) using superconducting parametrons(*3).

Using superconducting parametrons makes this quantum annealing machine resistant to noise and enables a long coherence time (duration for maintaining the quantum state)(*4). Coherence time is generally shortened during multi-qubit implementation. However, in addition to the noise-resistant characteristic of superconducting parametrons, the machine is able to maintain a long coherence time even in multi-qubit implementation by adopting the ParityQC architecture, a coupling technology that is highly compatible with parametrons. These features enable the calculation of real-world combinatorial optimization problems at high speed and with high accuracy.

In regard to these two technologies, NEC already succeeded in demonstrating the operation of the unit cell consisting of four qubits in March 2022(*5). Recently, it succeeded in developing a quantum annealing machine consisting of eight qubits by aligning the unit cells.

The newly developed 8-qubit chip based on unit cells with long coherence time

Tohoku University and NEC began joint research on high-performance computing technologies in 1958. In 2014, the Joint Research Division of High-Performance Computing (NEC) was established within the Tohoku University Cyberscience Center(*6) to conduct research aimed at solving various scientific and social issues. For the current joint research, Tohoku University and NEC will study the application of the above quantum annealing machine to many combinatorial optimization problems that exist in the real world, such as deriving optimal evacuation routes to mitigate damage and injuries from tsunami inundation.

Prior to this joint research, Tohoku University and NEC were already working on the development of quantum-annealing-assisted next-generation supercomputing platforms under Japans Ministry of Education, Culture, Sports, Science and Technologys (MEXT) Next-Generation Research and Development Project(*7) since 2018. This initiative is aimed at further improving the performance and sophistication of vector supercomputers, which have shown high processing capacity in many practical applications, and at developing a new supercomputing platform through functional complementation of vector supercomputers with quantum and simulated quantum annealing specialized for combinatorial optimization problems. In recognition of these initiatives on quantum annealing, Tohoku University has been accredited by Japans Cabinet Office as a "Quantum Solution Center"(*8).

In the current joint research, the 8-qubit quantum annealing machine based on superconducting parametrons developed by NEC and AIST will be made available to Tohoku University via the Internet. As part of this joint research, Tohoku University and NEC will utilize both the quantum annealing machine and the simulated quantum annealing machine (NEC Vector Annealing) that runs on the vector supercomputer "SX Aurora TSUBASA"(*9) installed at Tohoku University to leverage the features of both the quantum annealing machine and the simulated quantum annealing machine(*10). Going forward, Tohoku University and NEC will jointly conduct research on computing system architectures to solve complex social issues. Further, they will also explore use cases unique to quantum annealing, which has the potential to perform high-speed computations.

In addition to the simulated quantum annealing machine installed at Tohoku University, NEC and Tohoku University will also use the quantum annealing machine installed at AIST via the Internet. Researchers will examine the overall configuration of both machines in consideration of the effects of communication delays and other factors and feed the results back to the future development of both quantum annealing and simulated quantum annealing machines. Furthermore, in order to solve problems in the real world with the speed and accuracy of quantum annealing, they will investigate how to optimally allocate computations to both machines and endeavor to improve their usefulness.

Tohoku University and NEC will leverage this joint research as an opportunity to further accelerate the social implementation of quantum computing technologies.

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Research begins with a newly developed 8-qubit quantum ... - Scientific Computing World