A. Baroni

We present an efficient method to prepare states of a many-body system on quantum hardware, first isolating individual quantum numbers and then using time evolution to isolate the energy. Our method in its simplest form requires only one additional auxiliary qubit.

Abstract We calculate the β spectrum in the decay of He6 using quantum Monte Carlo methods with nuclear interactions derived from chiral effective field theory and consistent weak vector and axial currents. We work at second order in the multipole expansion, retaining terms suppressed by O(q2/mπ2), where q denotes low-energy scales such as the reaction's Q value or the electron energy, and mπ is the pion mass.