OpenFermion-FQE

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Spinless fermionic tight binding: Time evolution yields AssertionError

3

Hi, Noob here. Tried to time-evolve a TB Hamiltonian for spinless fermions, strting from a half-filled state ```python import fqe from openfermion import FermionOperator,hermitian_conjugated N=2 M=4 half_full = fqe.get_wavefunction(N, N,...

hariseldon99

Fix test references for dense Hamiltonian evolution and restore 100% line coverage

awhite862

pyscf to fqe wf

2

Leaving as a placeholder for when I have time to add commits and tests. ``` from pyscf.fci.cistring import make_strings def pyscf_to_fqe_wf(pyscf_cimat, pyscf_mf=None, norbs=None, nelec=None): if pyscf_mf is None: assert norbs...

ncrubin

Given the sparsity of lattice Hamiltonians should we have custom evolution routines? Or does `DiagonalCoulomb` cover enough of these uses?

ncrubin

In PR #128 where I fixed the Taylor expansion limit and max_expansion limit logic I introduced a logic path but did not explicitly test this path. Code coverage for the...

ncrubin

generate_antisymm_generator always returns 0 matrix not random matrix

1

The generage_antisymm_generator function returns zero matrix instead of random matrix. https://github.com/quantumlib/OpenFermion-FQE/blob/109a86418003fb14ee4aea9c88ffc1cd25d28d47/tests/generalized_doubles_factorization_test.py#L36 So, the test_generalized_doubles() is testing against zero matrix.

ungsik

Consider a unique definition for Wavefunction

2

`Wavefunction` is currently multiply defined, once as the [class](https://github.com/quantumlib/OpenFermion-FQE/blob/master/src/fqe/wavefunction.py#L52) and once as a getter [function](https://github.com/quantumlib/OpenFermion-FQE/blob/master/src/fqe/_fqe_control.py#L134) for the class. This caused a few issues with mypy, and while they are easily...

rmlarose

hamiltonian_time_evolution_and_expectation_estimation.ipynb does not work

2

On a fresh colab with an `fqe` install the notebook gives the following error: ``` --------------------------------------------------------------------------- ModuleNotFoundError Traceback (most recent call last) in () 4 import numpy 5 import fqe...

MichaelBroughton

Which Hamiltonian object to use

3

If I want to build a Hamiltonian from UHF I would do the following in pyscf + OpenFermion + FQE. This uses the `build_hamiltonian` function to translate the FermionOperator into...

ncrubin

Inconsistency between expectation values via SparseHamiltonian and get_restricted_hamiltonian?

12

Suppose I have an OpenFermion `InteractionOperator` and I want to measure its energy on a FQE wave function. It appears there are two routs to do this: 1) Convert the...

cvjjm