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Fix stabilizer effect detection for floating-point exponents #7770

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Fix stabilizer effect detection for floating-point exponents #7770

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6 changes: 3 additions & 3 deletions cirq-core/cirq/ops/common_gates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -285,7 +285,7 @@ def _phase_by_(self, phase_turns, qubit_index):
def _has_stabilizer_effect_(self) -> bool | None:
if self._is_parameterized_() or self._dimension != 2:
return None
return self.exponent % 0.5 == 0
return abs(self.exponent % 0.5) < 1e-8

def __str__(self) -> str:
if self._global_shift == 0:
Expand Down Expand Up @@ -480,7 +480,7 @@ def _phase_by_(self, phase_turns, qubit_index):
def _has_stabilizer_effect_(self) -> bool | None:
if self._is_parameterized_():
return None
return self.exponent % 0.5 == 0
return abs(self.exponent % 0.5) < 1e-8

def __str__(self) -> str:
if self._global_shift == 0:
Expand Down Expand Up @@ -760,7 +760,7 @@ def _phase_by_(self, phase_turns: float, qubit_index: int):
def _has_stabilizer_effect_(self) -> bool | None:
if self._is_parameterized_() or self._dimension != 2:
return None
return self.exponent % 0.5 == 0
return abs(self.exponent % 0.5) < 1e-8

def _circuit_diagram_info_(
self, args: cirq.CircuitDiagramInfoArgs
Expand Down
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