preparation of slater determinants and fermionic gaussian states

.pylintdict

@@ -53,6 +53,7 @@ cargs
 cartesian
 cbit
 ccx
+cdots
 cfg
 chc
 chiral
@@ -109,6 +110,7 @@ dimensionality
 discoverable
 distinguishability
 dll
+docstring
 dof
 doi
 dt
@@ -226,6 +228,7 @@ kwarg
 kwargs
 labelled
 lda
+ldots
 len
 leucine
 levinthal
@@ -240,6 +243,7 @@ ljik
 lk
 logfile
 lookback
+lvert
 lysine
 macos
 majorana
@@ -311,6 +315,7 @@ ortho
 orthonormal
 otimes
 outpath
+overline
 pac
 param
 parameterized
@@ -358,6 +363,7 @@ qubit
 qubits
 qutrit
 radians
+rangle
 rcccx
 rccx
 readme

.pylintrc

@@ -109,7 +109,7 @@ evaluation=10.0 - ((float(5 * error + warning + refactor + convention) / stateme
 
 # Good variable names which should always be accepted, separated by a comma
 # i,j,k = typical indices
-# n,m = typical numbers
+# n,m,p = typical numbers
 # ex = for exceptions and errors
 # v,w = typical vectors
 # x,y,z = typical axes
@@ -118,7 +118,7 @@ evaluation=10.0 - ((float(5 * error + warning + refactor + convention) / stateme
 # pi = the PI constant
 # op = operation iterator
 # b = basis iterator
-good-names=i,j,k,n,m,ex,v,w,x,y,z,Run,_,logger,q,c,r,qr,cr,qc,nd,pi,op,b,ar,br,a,mu,
+good-names=i,j,k,n,m,p,ex,v,w,x,y,z,Run,_,logger,q,c,r,qr,cr,qc,nd,pi,op,b,ar,br,a,mu,
     __unittest,iSwapGate
 
 # Bad variable names which should always be refused, separated by a comma
@@ -154,7 +154,7 @@ class-rgx=[A-Z_][a-zA-Z0-9]+$
 class-name-hint=[A-Z_][a-zA-Z0-9]+$
 
 # Regular expression matching correct function names
-function-rgx=[a-z_][a-z0-9_]{2,30}$
+function-rgx=[a-z_][a-z0-9_]{2,50}$
 
 # Naming hint for function names
 function-name-hint=[a-z_][a-z0-9_]{2,30}$

qiskit_nature/circuit/library/__init__.py

@@ -34,7 +34,9 @@
    :toctree: ../stubs/
    :nosignatures:
 
+   FermionicGaussianState
    HartreeFock
+   SlaterDeterminant
    VSCF
 
 Ansatzes
@@ -75,7 +77,7 @@
 
 from .gates import YXMinusXYInteractionGate
 
-from .initial_states import HartreeFock, VSCF
+from .initial_states import FermionicGaussianState, HartreeFock, SlaterDeterminant, VSCF
 
 __all__ = [
     "UCC",
@@ -88,4 +90,6 @@
     "UVCCSD",
     "VSCF",
     "YXMinusXYInteractionGate",
+    "FermionicGaussianState",
+    "SlaterDeterminant",
 ]

qiskit_nature/circuit/library/initial_states/__init__.py

@@ -11,7 +11,8 @@
 # that they have been altered from the originals.
 """Qiskit Nature Circuit Library Initial States."""
 
+from .fermionic_gaussian_states import FermionicGaussianState, SlaterDeterminant
 from .hartree_fock import HartreeFock
 from .vscf import VSCF
 
-__all__ = ["HartreeFock", "VSCF"]
+__all__ = ["FermionicGaussianState", "HartreeFock", "SlaterDeterminant", "VSCF"]