ABCI‑Q is a Quantum–Classical Hybrid Computing Infrastructure built to accelerate quantum application development. At its core is System H, a GPU‑based supercomputer, integrated with three distinct quantum computing platforms.

• System H: GPU-based supercomputer
• System F: Superconducting quantum computer
• System Q: Neutral atom quantum computer
• System O: Photonic quantum computer

ABCI‑Q delivers a quantum–classical hybrid computing environment that brings together simulations on System H, three distinct quantum platforms, and cloud‑based quantum resources. This flexible architecture enables users to combine or select systems to match their application needs.

System H

Compute Node

Each compute node is equipped with four NVIDIA H100 GPU accelerators, two 3rd‑generation Intel Xeon Scalable processors (code‑named Emerald Rapids), two NVMe SSDs, and 1 TB of DDR5 memory.

A single node delivers 274 TFLOPS in double‑precision performance for scientific computing and 4,164 TFLOPS in half‑precision performance for machine learning. Across all nodes, the system achieves 138 PFLOPS in double precision and 2.1 EFLOPS in half precision.

CPU	Intel Xeon Platinum 8558 Processor (2.1 GHz, 48 Cores, 260 MB Cache) ×2
GPU	NVIDIA H100 SXM5 80GB HBM3 ×4
Memory	1TB DDR5-5200
Local Storage	3.84TB NVMe SSD ×2
Interconnect	InfiniBand NDR200 (400Gbps) ×2

Storage System

The system includes ten storage units for large‑scale data and provides a shared file system. Using Lustre, a high‑performance distributed file system, it offers an effective capacity of about 41 PB.

Network

Compute nodes and the shared file system are connected through a high‑speed InfiniBand network, with all nodes fully interconnected at full bisection bandwidth. System H and each quantum computer are also linked via dedicated lines.

Software

Basic software for parallel and GPU computing is installed, and users can add their own tools to build custom development environments. Multiple quantum‑inspired annealing packages and quantum circuit simulators are also available.

System F

• A superconducting quantum computer developed by Fujitsu
• 64 physical qubit
• dvanced cryogenic wiring and large‑chip packaging technologies

System Q

• Neutral‑atom quantum computer from QuEra
• 260 physical qubits based on ^87Rb atoms
• Operates at room temperature
• Optical trapping and atomic control

System O

• Photonic quantum computer from OptQC, a University of Tokyo spin‑off
• Scheduled for installation in FY2025, Service launch planned for FY2026