Cleveland Clinic, RIKEN, and IBM Model a 12,635-Atom Protein – the Largest Known to Be Simulated with Quantum Computers

Cleveland Clinic, RIKEN, and IBM Model a 12,635-Atom Protein – the Largest Known to Be Simulated with Quantum Computers

By IBM Newsroom
Publication Date: 2026-05-05 12:00:00

YORKTOWN HEIGHTS, N.Y., and CLEVELAND — May 5, 2026 — Scientists at Cleveland Clinic, RIKEN, and IBM (NYSE: IBM) have used IBM quantum computers and two of the world’s most powerful supercomputers to simulate protein complexes spanning up to 12,635 atoms. These are the largest-known simulations of biologically meaningful molecules performed with quantum hardware yet, and signal that quantum computers are maturing into useful scientific tools which can help solve fundamental problems in biology, chemistry, and life sciences.

The results were achieved in part by an innovative algorithm that optimizes how quantum and classical computers can work together, a framework known as quantum-centric supercomputing. Using this approach, the team captured the behavior of two biochemically relevant proteins that are roughly 40 times larger than what this same method could initially achieve just six months ago. Additionally, the accuracy of the simulations in a key step of the workflow…