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FastFermion

fastfermion is a Python package written in C++ for the efficient manipulation of polynomials in Pauli, Fermi and Majorana operators.

Computing the Jordan-Wigner transform of a CrO molecule Hamiltonian with > 10^5 terms
Computing the Jordan-Wigner transform of a CrO molecule Hamiltonian with > 105 terms

Installation

fastfermion is available on PyPI:

pip3 install fastfermion

Features

  • Algebraic manipulation of polynomials in Pauli operators, Fermionic creation/annihilation operators, and Majorana operators.
  • Fermionic and Majorana operators are automatically put in normal ordered form
  • Conversion between Pauli, Fermi, and Majorana representations (Jordan-Wigner and reverse Jordan-Wigner)
  • Sparse matrix representations
  • Heisenberg evolution: Propagate polynomial through a sequence of unitaries/gates with possible truncation by degree
  • Interface with OpenFermion and Cirq
  • Up to 200x faster than OpenFermion
  • More to come ...

Important: The package is still under development and so the API may change at any time.

Issues

Please post any issues on the GitHub webpage: https://github.com/hfawzi/fastfermion/