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Observable Measurement - 4 - Sampling Loop #3647

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Observable Measurement - 4 - Sampling Loop #3647

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f0fc46f
Observable Measurement - Sampling Loop
mpharrigan Sep 30, 2020
18c8b8e
Merge remote-tracking branch 'origin/master' into 2020-10-operator-es…
mpharrigan Feb 11, 2021
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7 changes: 7 additions & 0 deletions cirq/ops/pauli_string.py
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Original file line number Diff line number Diff line change
Expand Up @@ -163,6 +163,11 @@ def __init__(
self._qubit_pauli_map = m._qubit_pauli_map
self._coefficient = m._coefficient

def copy(self):
return PauliString(
qubit_pauli_map=self._qubit_pauli_map.copy(), coefficient=self.coefficient
)

@property
def coefficient(self) -> complex:
return self._coefficient
Expand Down Expand Up @@ -397,6 +402,8 @@ def __repr__(self) -> str:
factors = []
if self._coefficient == -1:
prefix = '-'
elif self._coefficient == 1 and len(ordered_qubits) == 1:
factors.append('1')
elif self._coefficient != 1:
factors.append(repr(self._coefficient))

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3 changes: 3 additions & 0 deletions cirq/ops/pauli_string_test.py
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Expand Up @@ -307,6 +307,9 @@ def test_repr():
cirq.testing.assert_equivalent_repr(2 * pauli_string)
cirq.testing.assert_equivalent_repr(cirq.PauliString())

ps = cirq.PauliString({q2: cirq.X})
cirq.testing.assert_equivalent_repr(ps)


def test_str():
q0, q1, q2 = _make_qubits(3)
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