pennylane_to_qiskit_hamiltonian

This function helps to covert Pennylane Hamiltonian to QISKit Hamiltonian

Example

Prepare a qubit hamiltonian in Pennylane:

print(h_pennylane)

(-0.10633119275955037) [I0]
  + (0.1702977824748741) [Z0]
  + (0.1702977824748741) [Z1]
  + (-0.2200940322812765) [Z2]
  + (-0.22009403228127644) [Z3]
  + (0.16834151984303647) [Z0 Z1]
  + (0.045404703169106816) [Y0 X1 X2 Y3]
  + (-0.045404703169106816) [Y0 Y1 X2 X3]
  + (-0.045404703169106816) [X0 X1 Y2 Y3]
  + (0.045404703169106816) [X0 Y1 Y2 X3]
  + (0.1202071443598718) [Z0 Z2]
  + (0.1656118475289786) [Z0 Z3]
  + (0.1656118475289786) [Z1 Z2]
  + (0.1202071443598718) [Z1 Z3]
  + (0.17407821153636974) [Z2 Z3]

Then convert it to QISKit hamiltonian. And they are ready to be solved in QISKit VQE:

h_qiskit = to_qiskit_hamiltonian(h_pennylane,4)
print(h_qiskit.print_details())

IIII  (-0.10633119275955037+0j)
ZIII  (0.1702977824748741+0j)
IZII  (0.1702977824748741+0j)
IIZI  (-0.2200940322812765+0j)
IIIZ  (-0.22009403228127644+0j)
ZZII  (0.16834151984303647+0j)
YXXY  (0.045404703169106816+0j)
YYXX  (-0.045404703169106816+0j)
XXYY  (-0.045404703169106816+0j)
XYYX  (0.045404703169106816+0j)
ZIZI  (0.1202071443598718+0j)
ZIIZ  (0.1656118475289786+0j)
IZZI  (0.1656118475289786+0j)
IZIZ  (0.1202071443598718+0j)
IIZZ  (0.17407821153636974+0j)