  The fermionic quantum emulator (FQE) is a collection of protocols for
emulating quantum dynamics of fermions efficiently taking advantage of common
symmetries present in chemical, materials, and condensed-matter systems. The
library is fully integrated with the OpenFermion software package and serves as
the simulation backend. The FQE reduces memory footprint by exploiting number
and spin symmetry along with custom evolution routines for sparse and dense
Hamiltonians, allowing us to study significantly larger quantum circuits at
modest computational cost when compared against qubit state vector simulators.
This release paper outlines the technical details of the simulation methods and
key advantages.
