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Make (cirq.X, cirq.Y, cirq.Z)**1 returned type as _Pauli{X,Y,Z} instead of {X,Y,Z}PowGate #4330

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merged 9 commits into from
Jul 20, 2021
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Make (cirq.X, cirq.Y, cirq.Z)**1 returned type as _Pauli{X,Y,Z} instead of {X,Y,Z}PowGate #4330

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b2d9269
Fix the typo in clifford_gate::test_commutes_pauli
bichengying May 29, 2021
0234dda
Revert "Fix the typo in clifford_gate::test_commutes_pauli"
bichengying May 29, 2021
7596136
Merge remote-tracking branch 'upstream/master' into master
bichengying Jun 5, 2021
3121748
Merge remote-tracking branch 'upstream/master' into master
bichengying Jun 20, 2021
566db2f
Merge remote-tracking branch 'upstream/master' into master
bichengying Jun 24, 2021
3dbc1c3
Merge remote-tracking branch 'upstream/master' into master
bichengying Jul 17, 2021
213668c
Fix #4328
bichengying Jul 17, 2021
47ee836
return a new instance when exponent is 1
bichengying Jul 20, 2021
ed5dbc0
Merge branch 'master' into fix_pauli_pow
CirqBot Jul 20, 2021
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6 changes: 3 additions & 3 deletions cirq-core/cirq/ops/pauli_gates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,7 @@ def __init__(self):
common_gates.XPowGate.__init__(self, exponent=1.0)

def __pow__(self: '_PauliX', exponent: 'cirq.TParamVal') -> common_gates.XPowGate:
return common_gates.XPowGate(exponent=exponent)
return common_gates.XPowGate(exponent=exponent) if exponent != 1 else _PauliX()

def _with_exponent(self: '_PauliX', exponent: 'cirq.TParamVal') -> common_gates.XPowGate:
return self.__pow__(exponent)
Expand All @@ -135,7 +135,7 @@ def __init__(self):
common_gates.YPowGate.__init__(self, exponent=1.0)

def __pow__(self: '_PauliY', exponent: 'cirq.TParamVal') -> common_gates.YPowGate:
return common_gates.YPowGate(exponent=exponent)
return common_gates.YPowGate(exponent=exponent) if exponent != 1 else _PauliY()

def _with_exponent(self: '_PauliY', exponent: 'cirq.TParamVal') -> common_gates.YPowGate:
return self.__pow__(exponent)
Expand All @@ -162,7 +162,7 @@ def __init__(self):
common_gates.ZPowGate.__init__(self, exponent=1.0)

def __pow__(self: '_PauliZ', exponent: 'cirq.TParamVal') -> common_gates.ZPowGate:
return common_gates.ZPowGate(exponent=exponent)
return common_gates.ZPowGate(exponent=exponent) if exponent != 1 else _PauliZ()

def _with_exponent(self: '_PauliZ', exponent: 'cirq.TParamVal') -> common_gates.ZPowGate:
return self.__pow__(exponent)
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4 changes: 4 additions & 0 deletions cirq-core/cirq/ops/pauli_gates_test.py
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Expand Up @@ -216,3 +216,7 @@ def test_powers():
assert isinstance(cirq.X ** -0.5, cirq.XPowGate)
assert isinstance(cirq.Y ** 0.2, cirq.YPowGate)
assert isinstance(cirq.Z ** 0.5, cirq.ZPowGate)

assert isinstance(cirq.X ** 1, cirq.Pauli)
assert isinstance(cirq.Y ** 1, cirq.Pauli)
assert isinstance(cirq.Z ** 1, cirq.Pauli)