def test_gate_protocols():
for p in [1, 1j, -1]:
cirq.testing.assert_implements_consistent_protocols(
cirq.GlobalPhaseGate(p))
np.testing.assert_allclose(cirq.unitary(cirq.GlobalPhaseGate(1j)),
np.array([[1j]]),
atol=1e-8)
def test_gate_init():
gate = cirq.GlobalPhaseGate(1j)
assert gate.coefficient == 1j
assert isinstance(gate.on(), cirq.GateOperation)
assert gate.on().gate == gate
assert cirq.has_stabilizer_effect(gate)
with pytest.raises(ValueError, match='Coefficient is not unitary'):
_ = cirq.GlobalPhaseGate(2)
with pytest.raises(ValueError, match='Wrong number of qubits'):
_ = gate.on(cirq.LineQubit(0))
def test_gate_act_on_ch_form(phase):
state = cirq.StabilizerStateChForm(0)
args = cirq.StabilizerChFormSimulationState(
qubits=[], prng=np.random.RandomState(), initial_state=state
)
cirq.act_on(cirq.GlobalPhaseGate(phase), args, qubits=(), allow_decompose=False)
assert state.state_vector() == [[phase]]
def test_parameterization():
t = sympy.Symbol('t')
gpt = cirq.GlobalPhaseGate(coefficient=t)
assert cirq.is_parameterized(gpt)
assert cirq.parameter_names(gpt) == {'t'}
assert not cirq.has_unitary(gpt)
assert gpt.coefficient == t
assert (gpt**2).coefficient == t**2
def test_gate_act_on_tableau(phase):
original_tableau = cirq.CliffordTableau(0)
args = cirq.ActOnCliffordTableauArgs(original_tableau.copy(),
np.random.RandomState(), {})
cirq.act_on(cirq.GlobalPhaseGate(phase),
args,
qubits=(),
allow_decompose=False)
assert args.tableau == original_tableau
def test_gate_act_on_ch_form(phase):
state = cirq.StabilizerStateChForm(0)
args = cirq.ActOnStabilizerCHFormArgs(
qubits=[],
prng=np.random.RandomState(),
log_of_measurement_results={},
initial_state=state,
)
cirq.act_on(cirq.GlobalPhaseGate(phase),
args,
qubits=(),
allow_decompose=False)
assert state.state_vector() == [[phase]]
def test_resolve_error(resolve_fn):
t = sympy.Symbol('t')
gpt = cirq.GlobalPhaseGate(coefficient=t)
with pytest.raises(ValueError, match='Coefficient is not unitary'):
resolve_fn(gpt, {'t': -2})
def test_resolve(resolve_fn):
t = sympy.Symbol('t')
gpt = cirq.GlobalPhaseGate(coefficient=t)
assert resolve_fn(gpt, {'t': -1}) == cirq.GlobalPhaseGate(coefficient=-1)
def test_gate_global_phase_op_json_dict():
assert cirq.GlobalPhaseGate(-1j)._json_dict_() == {'coefficient': -1j}
def test_gate_op_repr():
gate = cirq.GlobalPhaseGate(1j)
cirq.testing.assert_equivalent_repr(gate.on())
def test_gate_str():
assert str(cirq.GlobalPhaseGate(1j)) == '1j'
def test_apply_gate():
q0, q1 = cirq.LineQubit.range(2)
state = Mock()
args = cirq.StabilizerSimulationState(state=state, qubits=[q0, q1])
assert args._strat_apply_gate(cirq.X, [q0]) is True
state.apply_x.assert_called_with(0, 1.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.X**2, [q0]) is True
state.apply_x.assert_called_with(0, 2.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.X**sympy.Symbol('t'),
[q0]) is NotImplemented
state.apply_x.assert_not_called()
state.reset_mock()
assert args._strat_apply_gate(cirq.XPowGate(exponent=2, global_shift=1.3),
[q1]) is True
state.apply_x.assert_called_with(1, 2.0, 1.3)
state.reset_mock()
assert args._strat_apply_gate(cirq.X**1.4, [q0]) == NotImplemented
state.apply_x.assert_not_called()
state.reset_mock()
assert args._strat_apply_gate(cirq.Y, [q0]) is True
state.apply_y.assert_called_with(0, 1.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.Z, [q0]) is True
state.apply_z.assert_called_with(0, 1.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.H, [q0]) is True
state.apply_h.assert_called_with(0, 1.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.CX, [q0, q1]) is True
state.apply_cx.assert_called_with(0, 1, 1.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.CX, [q1, q0]) is True
state.apply_cx.assert_called_with(1, 0, 1.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.CZ, [q0, q1]) is True
state.apply_cz.assert_called_with(0, 1, 1.0, 0.0)
state.reset_mock()
assert args._strat_apply_gate(cirq.GlobalPhaseGate(1j), []) is True
state.apply_global_phase.assert_called_with(1j)
state.reset_mock()
assert args._strat_apply_gate(cirq.GlobalPhaseGate(sympy.Symbol('t')),
[]) is NotImplemented
state.apply_global_phase.assert_not_called()
state.reset_mock()
assert args._strat_apply_gate(cirq.SWAP, [q0, q1]) is True
state.apply_cx.assert_has_calls(
[call(0, 1), call(1, 0, 1.0, 0.0),
call(0, 1)])
state.reset_mock()
assert args._strat_apply_gate(
cirq.SwapPowGate(exponent=2, global_shift=1.3), [q0, q1]) is True
state.apply_cx.assert_has_calls(
[call(0, 1), call(1, 0, 2.0, 1.3),
call(0, 1)])
state.reset_mock()
assert args._strat_apply_gate(cirq.BitFlipChannel(0.5),
[q0]) == NotImplemented
state.apply_x.assert_not_called()
