Stepan Fomichev

One of the key intended applications of quantum computers is to study properties of molecules and materials. To reduce computational runtime of quantum algorithms simulating molecules and materials, it is prudent to start from a high-quality initial wave function that is both cheap to obtain and prepare, and reasonably close to the desired solution.

Abstract It is well known that phonons can overscreen the bare Coulomb electron-electron repulsion, turning it into the effective attraction that binds the Cooper pairs responsible for BCS superconductivity. Here, we use a simple lattice model to prove that the counterpart of this is also possible, whereby phonons overscreen the bare electron-hole attraction and may turn it repulsive at short distances, driving exciton dissociation in certain regions of the parameter space.