def test_target_too_small_for_circuit(self):
"""Test error is raised when target is too small for circuit."""
target = Target()
target.add_instruction(
CXGate(),
{edge: None
for edge in CouplingMap.from_line(3).get_edges()})
dag = circuit_to_dag(QuantumCircuit(5))
layout_pass = DenseLayout(target=target)
with self.assertRaises(TranspilerError):
layout_pass.run(dag)
def test_ideal_target_no_coupling(self):
"""Test pass fails as expected if a target without edge constraints exists."""
qr = QuantumRegister(5, "q")
circuit = QuantumCircuit(qr)
circuit.cx(qr[0], qr[3])
circuit.cx(qr[3], qr[4])
circuit.cx(qr[3], qr[1])
circuit.cx(qr[0], qr[2])
dag = circuit_to_dag(circuit)
target = Target(num_qubits=19)
target.add_instruction(CXGate())
layout_pass = DenseLayout(target=target)
with self.assertRaises(TranspilerError):
layout_pass.run(dag)
def test_5q_circuit_19q_target_with_noise(self):
"""Test layout works finds a dense 5q subgraph in a 19q heavy hex target."""
qr = QuantumRegister(5, "q")
circuit = QuantumCircuit(qr)
circuit.cx(qr[0], qr[3])
circuit.cx(qr[3], qr[4])
circuit.cx(qr[3], qr[1])
circuit.cx(qr[0], qr[2])
dag = circuit_to_dag(circuit)
pass_ = DenseLayout(target=self.target_19)
pass_.run(dag)
layout = pass_.property_set["layout"]
self.assertEqual(layout[qr[0]], 9)
self.assertEqual(layout[qr[1]], 3)
self.assertEqual(layout[qr[2]], 11)
self.assertEqual(layout[qr[3]], 15)
self.assertEqual(layout[qr[4]], 4)
def test_6q_circuit_20q_coupling(self):
"""Test finds dense 5q corner in 20q coupling map."""
qr0 = QuantumRegister(3, "q0")
qr1 = QuantumRegister(3, "q1")
circuit = QuantumCircuit(qr0, qr1)
circuit.cx(qr0[0], qr1[2])
circuit.cx(qr1[1], qr0[2])
dag = circuit_to_dag(circuit)
pass_ = DenseLayout(CouplingMap(self.cmap20))
pass_.run(dag)
layout = pass_.property_set["layout"]
self.assertEqual(layout[qr0[0]], 11)
self.assertEqual(layout[qr0[1]], 10)
self.assertEqual(layout[qr0[2]], 6)
self.assertEqual(layout[qr1[0]], 5)
self.assertEqual(layout[qr1[1]], 1)
self.assertEqual(layout[qr1[2]], 0)
def test_5q_circuit_20q_coupling(self):
"""Test finds dense 5q corner in 20q coupling map."""
qr = QuantumRegister(5, "q")
circuit = QuantumCircuit(qr)
circuit.cx(qr[0], qr[3])
circuit.cx(qr[3], qr[4])
circuit.cx(qr[3], qr[1])
circuit.cx(qr[0], qr[2])
dag = circuit_to_dag(circuit)
pass_ = DenseLayout(CouplingMap(self.cmap20))
pass_.run(dag)
layout = pass_.property_set["layout"]
self.assertEqual(layout[qr[0]], 11)
self.assertEqual(layout[qr[1]], 10)
self.assertEqual(layout[qr[2]], 6)
self.assertEqual(layout[qr[3]], 5)
self.assertEqual(layout[qr[4]], 0)
def test_5q_circuit_19q_target_without_noise(self):
"""Test layout works finds a dense 5q subgraph in a 19q heavy hex target with no noise."""
qr = QuantumRegister(5, "q")
circuit = QuantumCircuit(qr)
circuit.cx(qr[0], qr[3])
circuit.cx(qr[3], qr[4])
circuit.cx(qr[3], qr[1])
circuit.cx(qr[0], qr[2])
dag = circuit_to_dag(circuit)
instruction_props = {
edge: None
for edge in CouplingMap.from_heavy_hex(3).get_edges()
}
noiseless_target = Target()
noiseless_target.add_instruction(CXGate, instruction_props)
pass_ = DenseLayout(target=noiseless_target)
pass_.run(dag)
layout = pass_.property_set["layout"]
self.assertEqual(layout[qr[0]], 1)
self.assertEqual(layout[qr[1]], 13)
self.assertEqual(layout[qr[2]], 0)
self.assertEqual(layout[qr[3]], 9)
self.assertEqual(layout[qr[4]], 3)