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Add _act_on_ for StabilizerStateChForm to GlobalPhaseOp #3448

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Merged
merged 3 commits into from
Oct 28, 2020
Merged

Add _act_on_ for StabilizerStateChForm to GlobalPhaseOp #3448

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af0192a
Add _act_on_ for StabilizerStateChForm to GlobalPhaseOp
smitsanghavi Oct 28, 2020
e0d604d
mend
smitsanghavi Oct 28, 2020
73c1647
Test state_vector instead of just omega
smitsanghavi Oct 28, 2020
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8 changes: 8 additions & 0 deletions cirq/ops/global_phase_op.py
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,14 @@ def _apply_unitary_(self, args) -> np.ndarray:
args.target_tensor *= self.coefficient
return args.target_tensor

def _act_on_(self, args: Any):
from cirq.sim import clifford
if isinstance(args, clifford.ActOnStabilizerCHFormArgs):
args.state.omega *= self.coefficient # type: ignore
return True

return NotImplemented

def __str__(self) -> str:
return str(self.coefficient)

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8 changes: 8 additions & 0 deletions cirq/ops/global_phase_op_test.py
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Expand Up @@ -40,6 +40,14 @@ def test_protocols():
atol=1e-8)


@pytest.mark.parametrize('phase', [1, 1j, -1])
def test_act_on(phase):
state = cirq.StabilizerStateChForm(0)
args = cirq.ActOnStabilizerCHFormArgs(state, [])
cirq.act_on(cirq.GlobalPhaseOperation(phase), args, allow_decompose=False)
assert state.state_vector() == [[phase]]


def test_str():
assert str(cirq.GlobalPhaseOperation(1j)) == '1j'

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