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Row-vectorisation for open systems #248

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Row-vectorisation for open systems #248

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d816374
Create draft PR for #247
github-actions[bot] Dec 14, 2023
ad50948
Using row vectorisation (#247)
Dec 14, 2023
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6 changes: 3 additions & 3 deletions src/quanguru/QuantumToolbox/evolution.py
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Original file line number Diff line number Diff line change
Expand Up @@ -305,7 +305,7 @@ def _preSO(operator: Matrix, identity: Matrix = None) -> Matrix:

if identity is None:
identity = sp.identity(operator.shape[0], format="csc")
pre = sp.kron(identity, operator, format='csc')
pre = sp.kron(operator, identity, format='csc')
return pre if sp.issparse(operator) else pre.A

def _postSO(operator: Matrix, identity: Matrix = None) -> Matrix:
Expand Down Expand Up @@ -338,7 +338,7 @@ def _postSO(operator: Matrix, identity: Matrix = None) -> Matrix:

if identity is None:
identity = sp.identity(operator.shape[0], format="csc")
pos = sp.kron(operator.transpose(), identity, format='csc')
pos = sp.kron(identity, operator.transpose(), format='csc')
return pos if sp.issparse(operator) else pos.A

def _prepostSO(operatorA: Matrix, operatorB: Optional[Matrix] = None) -> Matrix:
Expand Down Expand Up @@ -371,7 +371,7 @@ def _prepostSO(operatorA: Matrix, operatorB: Optional[Matrix] = None) -> Matrix:
"""
if operatorB is None:
operatorB = operatorA
prepost = sp.kron(operatorB.transpose(), operatorA, format='csc')
prepost = sp.kron(operatorA, operatorB.transpose(), format='csc')
return prepost if sp.issparse(operatorA) else prepost.A

def evolveOpen(initialState, totalTime, timeStep: float = 1.0, Hamiltonian: Optional[Matrix] = None,# pylint: disable=dangerous-default-value,unsubscriptable-object,too-many-arguments # noqa: E501
Expand Down
4 changes: 2 additions & 2 deletions src/quanguru/QuantumToolbox/states.py
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Expand Up @@ -542,7 +542,7 @@ def mat2Vec(denMat: Matrix) -> Matrix: # pylint: disable=invalid-name
[1]]
"""

return denMat.T.reshape(np.prod(np.shape(denMat)), 1)
return denMat.reshape(np.prod(np.shape(denMat)), 1)

def vec2Mat(vec: Matrix) -> Matrix: # pylint: disable=invalid-name
r"""
Expand Down Expand Up @@ -575,7 +575,7 @@ def vec2Mat(vec: Matrix) -> Matrix: # pylint: disable=invalid-name

a = vec.shape
n = int(np.sqrt(a[0]))
mat = vec.reshape((n, n)).T
mat = vec.reshape((n, n))
return mat

def BellStates(bs: str = 'Phi+', sparse: bool = True) -> Matrix:
Expand Down
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