def test_map_wires_exception_mismatch_in_number_of_wires(self, recorder):
"""Tests that the map_wires function raises an exception if there is a mismatch between
wires."""
wires = [0, 1, 2]
qc = QuantumCircuit(1)
qc_wires = [hash(q) for q in qc.qubits]
with pytest.raises(
qml.QuantumFunctionError,
match="The specified number of wires - {} - does not match "
"the number of wires the loaded quantum circuit acts on.".format(len(wires)),
):
map_wires(qc_wires, wires)
def test_map_wires(self, recorder):
"""Tests the map_wires function for wires of a quantum circuit."""
wires = [0]
qc = QuantumCircuit(1)
qc_wires = [hash(q) for q in qc.qubits]
assert map_wires(wires, qc_wires) == {0: hash(qc.qubits[0])}
def test_map_wires(self, recorder):
"""Tests the map_wires function for wires of a quantum circuit."""
wires = [0]
qc = QuantumCircuit(1)
qc_wires = [(q.register.name, q.index) for q in qc.qubits]
assert map_wires(qc_wires, wires) == {0: ('q', 0)}
def test_map_wires_provided_non_standard_order(self, recorder):
"""Tests the map_wires function for wires of non-standard order."""
wires = [1, 2, 0]
qc = QuantumCircuit(3)
qc_wires = [(q.register.name, q.index) for q in qc.qubits]
mapped_wires = map_wires(qc_wires, wires)
assert len(mapped_wires) == len(wires)
assert set(mapped_wires.keys()) == set(wires)
for q in qc.qubits:
assert (q.register.name, q.index) in mapped_wires.values()
assert mapped_wires[0][1] == 2
assert mapped_wires[1][1] == 0
assert mapped_wires[2][1] == 1
def test_map_wires_provided_non_standard_order(self, recorder):
"""Tests the map_wires function for wires of non-standard order."""
wires = [1, 2, 0]
qc = QuantumCircuit(3)
qc_wires = [hash(q) for q in qc.qubits]
mapped_wires = map_wires(wires, qc_wires)
for q in qc.qubits:
assert hash(q) in mapped_wires.values()
assert len(mapped_wires) == len(wires)
assert set(mapped_wires.keys()) == set(wires)
assert mapped_wires[0] == qc_wires[2]
assert mapped_wires[1] == qc_wires[0]
assert mapped_wires[2] == qc_wires[1]
def test_map_wires_instantiate_quantum_circuit_with_registers(self, recorder):
"""Tests the map_wires function for wires of a quantum circuit instantiated
using quantum registers."""
wires = [0, 1, 2]
qr1 = QuantumRegister(1)
qr2 = QuantumRegister(1)
qr3 = QuantumRegister(1)
qc = QuantumCircuit(qr1, qr2, qr3)
qc_wires = [hash(q) for q in qc.qubits]
mapped_wires = map_wires(wires, qc_wires)
assert len(mapped_wires) == len(wires)
assert list(mapped_wires.keys()) == wires
for q in qc.qubits:
assert hash(q) in mapped_wires.values()
