Projector Quantum Monte Carlo Method for Nonlinear Wave Functions

G. H. B. gratefully acknowledges funding from the Royal Society via a University Research Fellowship, as well as support from the Air Force Office of Scientific Research via Grant No. FA9550-16-1-0256. A. A. acknowledges support from the EPSRC, Grant No. EP/J003867/1. L. R. S. is supported by an EPSRC studentship.