A new method unlocks quantum speedups for common chemistry simulations

Jielun Chen of the California Institute of Technology and Garnet Kin-Lic Chan have developed a framework for achieving quantum speedups in simulating the behavior of correlated electrons, a challenge at the heart of modern chemistry. Their work distinguishes itself by targeting calculations precisely where widely used classical methods already perform well, rather than seeking advantage where those methods fail. The researchers describe how to obtain these speedups for correlated electronic structure and dynamics, focusing on problems where classical heuristics scale linearly with the number of atoms. They write, potentially enabling simulations of systems with thousands of atoms using moderate quantum resources. Researchers are achieving quantum simulation speedups not by tackling problems beyond the reach of conventional computers, but by improving upon calculations already handled efficiently by existing classical methods. This approach,…