def test_measurement_gate_diagram():
# Shows observable & key.
assert cirq.circuit_diagram_info(
cirq.PauliMeasurementGate([cirq.X], key='test')
) == cirq.CircuitDiagramInfo(("M(X)('test')",))
# Shows multiple observables.
assert cirq.circuit_diagram_info(
cirq.PauliMeasurementGate([cirq.X, cirq.Y, cirq.Z], 'a')
) == cirq.CircuitDiagramInfo(("M(X)('a')", 'M(Y)', 'M(Z)'))
# Omits key when it is the default.
a = cirq.NamedQubit('a')
b = cirq.NamedQubit('b')
cirq.testing.assert_has_diagram(
cirq.Circuit(cirq.measure_single_paulistring(cirq.X(a) * cirq.Y(b))),
"""
a: ───M(X)───
│
b: ───M(Y)───
""",
)
cirq.testing.assert_has_diagram(
cirq.Circuit(cirq.measure_single_paulistring(cirq.X(a) * cirq.Y(b), key='test')),
"""
a: ───M(X)('test')───
│
b: ───M(Y)───────────
""",
)
def test_with_observable():
o1 = [cirq.Z, cirq.Y, cirq.X]
o2 = [cirq.X, cirq.Y, cirq.Z]
g1 = cirq.PauliMeasurementGate(o1, key='a')
g2 = cirq.PauliMeasurementGate(o2, key='a')
assert g1.with_observable(o2) == g2
assert g1.with_observable(o1) is g1
def test_measurement_eq():
eq = cirq.testing.EqualsTester()
eq.make_equality_group(
lambda: cirq.PauliMeasurementGate([cirq.X, cirq.Y], 'a'),
lambda: cirq.PauliMeasurementGate([cirq.X, cirq.Y], cirq.MeasurementKey('a')),
)
eq.add_equality_group(cirq.PauliMeasurementGate([cirq.X, cirq.Y], 'b'))
eq.add_equality_group(cirq.PauliMeasurementGate([cirq.Y, cirq.X], 'a'))
def test_bad_observable_raises():
with pytest.raises(ValueError, match='Pauli observable .* is empty'):
_ = cirq.PauliMeasurementGate([])
with pytest.raises(ValueError, match=r'Pauli observable .* must be Iterable\[`cirq.Pauli`\]'):
_ = cirq.PauliMeasurementGate([cirq.I, cirq.X, cirq.Y])
with pytest.raises(ValueError, match=r'Pauli observable .* must be Iterable\[`cirq.Pauli`\]'):
_ = cirq.PauliMeasurementGate(cirq.DensePauliString('XYZI'))
def test_init(observable, key):
g = cirq.PauliMeasurementGate(observable, key)
assert g.num_qubits() == len(observable)
assert g.key == 'a'
assert g.mkey == cirq.MeasurementKey('a')
assert g._observable == cirq.DensePauliString(observable)
assert cirq.qid_shape(g) == (2,) * len(observable)
def test_measure_paulistring_terms():
# Correct application
q = cirq.LineQubit.range(3)
ps = cirq.X(q[0]) * cirq.Y(q[1]) * cirq.Z(q[2])
assert cirq.measure_paulistring_terms(ps) == [
cirq.PauliMeasurementGate([cirq.X], key=str(q[0])).on(q[0]),
cirq.PauliMeasurementGate([cirq.Y], key=str(q[1])).on(q[1]),
cirq.PauliMeasurementGate([cirq.Z], key=str(q[2])).on(q[2]),
]
# Empty application
with pytest.raises(ValueError, match='should be an instance of cirq.PauliString'):
_ = cirq.measure_paulistring_terms(cirq.I(q[0]) * cirq.I(q[1]))
# Wrong type
with pytest.raises(ValueError, match='should be an instance of cirq.PauliString'):
_ = cirq.measure_paulistring_terms(q)
def test_eval_repr(key):
# Basic safeguard against repr-inequality.
op = cirq.GateOperation(
gate=cirq.PauliMeasurementGate([cirq.X, cirq.Y], key),
qubits=[cirq.GridQubit(0, 1), cirq.GridQubit(1, 1)],
)
cirq.testing.assert_equivalent_repr(op)
assert cirq.is_measurement(op)
assert cirq.measurement_key_name(op) == str(key)
def test_setters_deprecated():
gate = cirq.PauliMeasurementGate(cirq.DensePauliString("Z", coefficient=+1), key='m')
with cirq.testing.assert_deprecated('mutators', deadline='v0.15'):
gate.key = 'n'
assert gate.key == 'n'
assert gate.mkey == cirq.MeasurementKey('n')
with cirq.testing.assert_deprecated('mutators', deadline='v0.15'):
gate.key = cirq.MeasurementKey('o')
assert gate.key == 'o'
assert gate.mkey == cirq.MeasurementKey('o')
with cirq.testing.assert_deprecated('mutators', deadline='v0.15'):
gate.mkey = cirq.MeasurementKey('p')
assert gate.key == 'p'
assert gate.mkey == cirq.MeasurementKey('p')
def test_measure_single_paulistring():
# Correct application
q = cirq.LineQubit.range(3)
ps = cirq.X(q[0]) * cirq.Y(q[1]) * cirq.Z(q[2])
assert cirq.measure_single_paulistring(ps, key='a') == cirq.PauliMeasurementGate(
ps.values(), key='a'
).on(*ps.keys())
# Empty application
with pytest.raises(ValueError, match='should be an instance of cirq.PauliString'):
_ = cirq.measure_single_paulistring(cirq.I(q[0]) * cirq.I(q[1]))
# Wrong type
with pytest.raises(ValueError, match='should be an instance of cirq.PauliString'):
_ = cirq.measure_single_paulistring(q)
def test_pauli():
q0, q1 = cirq.LineQubit.range(2)
circuit = cirq.Circuit(
cirq.PauliMeasurementGate(cirq.DensePauliString('Y'), key='a').on(q0),
cirq.X(q1).with_classical_controls('a'),
cirq.measure(q1, key='b'),
)
deferred = cirq.defer_measurements(circuit)
q_ma = _MeasurementQid('a', q0)
cirq.testing.assert_same_circuits(
cirq.unroll_circuit_op(deferred),
cirq.Circuit(
cirq.SingleQubitCliffordGate.X_sqrt(q0),
cirq.CX(q0, q_ma),
(cirq.SingleQubitCliffordGate.X_sqrt(q0)**-1),
cirq.Moment(cirq.CX(q_ma, q1)),
cirq.measure(q_ma, key='a'),
cirq.measure(q1, key='b'),
),
)
def test_measurement_has_unitary_returns_false():
gate = cirq.PauliMeasurementGate([cirq.X], 'a')
assert not cirq.has_unitary(gate)
def test_pauli_measurement_gate_samples(rot, obs, out):
q = cirq.NamedQubit("q")
c = cirq.Circuit(rot(q), cirq.PauliMeasurementGate(obs, key='out').on(q))
assert cirq.Simulator().sample(c)['out'][0] == out
def test_consistent_protocols(observable, key):
gate = cirq.PauliMeasurementGate(observable, key=key)
cirq.testing.assert_implements_consistent_protocols(gate)
assert cirq.is_measurement(gate)
assert cirq.measurement_key_name(gate) == str(key)
eq.add_equality_group(cirq.PauliMeasurementGate([cirq.X, cirq.Y], 'b'))
eq.add_equality_group(cirq.PauliMeasurementGate([cirq.Y, cirq.X], 'a'))
@pytest.mark.parametrize(
'protocol,args,key',
[
(None, None, 'b'),
(cirq.with_key_path, ('p', 'q'), 'p:q:a'),
(cirq.with_measurement_key_mapping, {'a': 'b'}, 'b'),
],
)
@pytest.mark.parametrize(
'gate',
[
cirq.PauliMeasurementGate([cirq.X], 'a'),
cirq.PauliMeasurementGate([cirq.X, cirq.Y, cirq.Z], 'a'),
],
)
def test_measurement_with_key(protocol, args, key, gate):
if protocol:
gate_with_key = protocol(gate, args)
else:
gate_with_key = gate.with_key('b')
assert gate_with_key.key == key
assert gate_with_key.num_qubits() == gate.num_qubits()
assert gate_with_key.observable() == gate.observable()
assert cirq.qid_shape(gate_with_key) == cirq.qid_shape(gate)
if protocol:
same_gate = cirq.with_measurement_key_mapping(gate, {'a': 'a'})
else:
def test_inconclusive():
class No:
pass
assert not cirq.has_unitary(object())
assert not cirq.has_unitary('boo')
assert not cirq.has_unitary(No())
@pytest.mark.parametrize(
'measurement_gate',
(
cirq.MeasurementGate(1, 'a'),
cirq.PauliMeasurementGate([cirq.X], 'a'),
),
)
def test_fail_fast_measure(measurement_gate):
assert not cirq.has_unitary(measurement_gate)
qubit = cirq.NamedQubit('q0')
circuit = cirq.Circuit()
circuit += measurement_gate(qubit)
circuit += cirq.H(qubit)
assert not cirq.has_unitary(circuit)
def test_fail_fast_measure_large_memory():
num_qubits = 100
measurement_op = cirq.MeasurementGate(
import cirq
def test_inconclusive():
class No:
pass
assert not cirq.has_unitary(object())
assert not cirq.has_unitary('boo')
assert not cirq.has_unitary(No())
@pytest.mark.parametrize(
'measurement_gate',
(cirq.MeasurementGate(1, 'a'), cirq.PauliMeasurementGate([cirq.X], 'a')))
def test_fail_fast_measure(measurement_gate):
assert not cirq.has_unitary(measurement_gate)
qubit = cirq.NamedQubit('q0')
circuit = cirq.Circuit()
circuit += measurement_gate(qubit)
circuit += cirq.H(qubit)
assert not cirq.has_unitary(circuit)
def test_fail_fast_measure_large_memory():
num_qubits = 100
measurement_op = cirq.MeasurementGate(
num_qubits, 'a').on(*cirq.LineQubit.range(num_qubits))
assert not cirq.has_unitary(measurement_op)