Their application to quantum chemistry/condensed matter is certainly pretty exciting. Currently the practical method for realistic system sizes, density-functio

Their application to quantum chemistry/condensed matter is certainly pretty exciting. Currently the practical method for realistic system sizes, density-function theory (DFT), is barely quantitatively accurate for many important systems/properties. I've heard it suggested that current DFT codes could use a quantum computer as a co-processor to handle strongly correlated parts of systems, which is an interesting idea. Just speeding up post-Hartree Fock methods would be nice, and they're already polynomial but impractical! Do you have any references for the hardness of putting the quantum system into the quantum computer? I haven't heard of that issue before. I wouldn't have thought relativity is much of a problem, that's just a tweak to the Hamiltonian.