Author

S. Bravyi

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Preprint Oct 2026

Quantum impurity models: easy at equilibrium, universal in motion

A quantum impurity model describes a small interacting subsystem embedded into a large bath of free fermions. Here we study the computational complexity of calculating the ground energy, thermal equilibrium, and dynamical properties of these models. Our work reveals a sharp contrast: equilibrium properties can be effic...

Srinivasan Arunachalam, S. Bravyi, Anirban Narayan Chowdhury et al. · 0 citations

Preprint Jul 2026

Efficient quantum algorithm for Heisenberg spin systems

An efficient quantum adiabatic algorithm is obtained for the ground energy of any model in this family of Heisenberg-type quantum spin systems, based on a new inequality that relates the spectral gap of a positive semidefinite operator to its Lee-Yang radius.

S. Bravyi, David Gosset, Yin-Chen Liu et al. · 3 citations