Researchers have studied an open quantum system simulation on quantum hardware, which demonstrates robustness to hardware errors even with deep circuits containing up to two thousand entangling gates.
They simulated two systems of electrons coupled to an infinite thermal bath: 1) a system of dissipative free electrons in a driving electric field; and 2) the thermalization of two interacting electrons in a single orbital in a magnetic field—the Hubbard atom.
These problems are solved using IBM quantum computers, showing no signs of decreasing fidelity at long times.
These results demonstrate that algorithms for simulating open quantum systems are able to far outperform similarly complex non-dissipative algorithms on noisy hardware.
These two examples show promise that the driven-dissipative quantum many-body problem can eventually be solved on quantum computers.
npj Quantum Information, Published online: 21 January 2025; doi:10.1038/s41534-025-00964-8
