def _qcircuit_4qubit_entanglement(theta_aux):
C = QCircuit(4)
for l in range(theta_aux.shape[1] - 1):
for q in range(theta_aux.shape[0]):
C.U3(q, theta_aux[q,l,:])
if l%2 == 0:
C.Cz(0,1)
C.Cz(2,3)
elif l%2 == 1:
C.Cz(1,2)
C.Cz(0,3)
for q in range(theta_aux.shape[0]):
C.U3(q, theta_aux[q,-1,:])
return C
def _qcircuit_2qubit_entanglement(theta_aux):
C = QCircuit(2)
for l in range(theta_aux.shape[1] - 1):
for q in range(theta_aux.shape[0]):
C.U3(q, theta_aux[q,l,:])
C.Cz(0,1)
for q in range(theta_aux.shape[0]):
C.U3(q, theta_aux[q,-1,:])
return C