Universal Quantum Computer Simulation of 50 Qubits on Europe`s First Exascale Supercomputer Harnessing Its Heterogeneous CPU-GPU Architecture

TL;DR

The paper presents JUQCS-50, a high-performance quantum computer simulator capable of simulating 50 qubits on Europe’s first exascale supercomputer, utilizing innovative memory and data encoding techniques.

Contribution

It introduces three key innovations that enable 50-qubit simulations, surpassing previous records and leveraging the supercomputer's heterogeneous CPU-GPU architecture.

Findings

Achieved 16.6-fold speedup over previous 48-qubit simulations.

Enabled simulation of a 50-qubit quantum computer for the first time.

Utilized high-bandwidth CPU-GPU interconnects and adaptive data encoding.

Abstract

We have developed a new version of the high-performance J\"ulich universal quantum computer simulator (JUQCS-50) that leverages key features of the GH200 superchips as used in the JUPITER supercomputer, enabling simulations of a 50-qubit universal quantum computer for the first time. JUQCS-50 achieves this through three key innovations: (1) extending usable memory beyond GPU limits via high-bandwidth CPU-GPU interconnects and LPDDR5 memory; (2) adaptive data encoding to reduce memory footprint with acceptable trade-offs in precision and compute effort; and (3) an on-the-fly network traffic optimizer. These advances result in a 16.6-fold speedup over the previous 48-qubit record on the K computer