Create a more readable representation for QubitPauliOperator

[CalMacCQ]

Currently printing a QubitPauliOperator (QPO) just gives a dict of the Pauli terms and the weights (to about 15 decimal places) (see below). We could could create a nicer __str__() representation for this or even display it with LaTeX as we do with circuit_to_symbolic_unitary.

from pytket import Circuit, Qubit
from pytket.pauli import Pauli, QubitPauliString
from pytket.utils import QubitPauliOperator

zzi = QubitPauliString({Qubit(0): Pauli.Z, Qubit(1):Pauli.Z, Qubit(2):Pauli.I})
ixy = QubitPauliString({Qubit(0): Pauli.I, Qubit(1):Pauli.X, Qubit(2):Pauli.Y})

qpo = QubitPauliOperator({zzi: 0.2, ixy: 0.7})

print(qpo)

Currently gives...

{(Zq[0], Zq[1], Iq[2]): 0.200000000000000, (Iq[0], Xq[1], Yq[2]): 0.700000000000000}

Another old QPO issue

[github-actions]

This issue has been automatically marked as stale.