def test_empty_coupling_class(self):
coupling = CouplingMap()
self.assertEqual(0, coupling.size())
self.assertEqual([], coupling.physical_qubits)
self.assertEqual([], coupling.get_edges())
self.assertFalse(coupling.is_connected())
self.assertEqual("", str(coupling))
def test_only_output_cx_and_swaps_in_coupling_map(self):
"""Test that output DAG contains only 2q gates from the the coupling map."""
coupling = CouplingMap([[0, 1], [1, 2], [2, 3]])
qr = QuantumRegister(4, 'q')
cr = ClassicalRegister(4, 'c')
circuit = QuantumCircuit(qr, cr)
circuit.h(qr[0])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[0], qr[2])
circuit.cx(qr[0], qr[3])
circuit.measure(qr, cr)
dag = circuit_to_dag(circuit)
layout = Layout({qr[0]: 0, qr[1]: 1, qr[2]: 2, qr[3]: 3})
pass_ = StochasticSwap(coupling, layout, 20, 5)
after = pass_.run(dag)
valid_couplings = [
set([layout[a], layout[b]]) for (a, b) in coupling.get_edges()
]
for _2q_gate in after.twoQ_gates():
self.assertIn(set(_2q_gate.qargs), valid_couplings)
def test_make_symmetric(self):
coupling_list = [[0, 1], [0, 2]]
coupling = CouplingMap(coupling_list)
coupling.make_symmetric()
edges = coupling.get_edges()
self.assertEqual(set(edges), {(0, 1), (0, 2), (2, 0), (1, 0)})
def test_init_with_couplinglist(self):
coupling_list = [[0, 1], [1, 2]]
coupling = CouplingMap(coupling_list)
qubits_expected = [0, 1, 2]
edges_expected = [(0, 1), (1, 2)]
self.assertEqual(coupling.physical_qubits, qubits_expected)
self.assertEqual(coupling.get_edges(), edges_expected)
self.assertEqual(2, coupling.distance(0, 2))
def test_do_not_change_cm(self):
"""Coupling map should not change.
See https://github.com/Qiskit/qiskit-terra/issues/5675"""
cm_edges = [(1, 0), (2, 0), (2, 1), (3, 2), (3, 4), (4, 2)]
coupling = CouplingMap(cm_edges)
passmanager = PassManager(SabreSwap(coupling))
_ = passmanager.run(QuantumCircuit(1))
self.assertEqual(set(cm_edges), set(coupling.get_edges()))
def test_qv_natural(self):
"""check that quantum volume circuit compiles for natural direction"""
qv64 = QuantumVolume(5, seed=15)
def construct_passmanager(basis_gates, coupling_map, synthesis_fidelity, pulse_optimize):
def _repeat_condition(property_set):
return not property_set["depth_fixed_point"]
seed = 2
_map = [SabreLayout(coupling_map, max_iterations=2, seed=seed)]
_embed = [FullAncillaAllocation(coupling_map), EnlargeWithAncilla(), ApplyLayout()]
_unroll3q = Unroll3qOrMore()
_swap_check = CheckMap(coupling_map)
_swap = [
BarrierBeforeFinalMeasurements(),
SabreSwap(coupling_map, heuristic="lookahead", seed=seed),
]
_check_depth = [Depth(), FixedPoint("depth")]
_optimize = [
Collect2qBlocks(),
ConsolidateBlocks(basis_gates=basis_gates),
UnitarySynthesis(
basis_gates,
synthesis_fidelity,
coupling_map,
pulse_optimize=pulse_optimize,
natural_direction=True,
),
Optimize1qGates(basis_gates),
]
pm = PassManager()
pm.append(_map) # map to hardware by inserting swaps
pm.append(_embed)
pm.append(_unroll3q)
pm.append(_swap_check)
pm.append(_swap)
pm.append(
_check_depth + _optimize, do_while=_repeat_condition
) # translate to & optimize over hardware native gates
return pm
coupling_map = CouplingMap([[0, 1], [1, 2], [3, 2], [3, 4], [5, 4]])
basis_gates = ["rz", "sx", "cx"]
pm1 = construct_passmanager(
basis_gates=basis_gates,
coupling_map=coupling_map,
synthesis_fidelity=0.99,
pulse_optimize=True,
)
pm2 = construct_passmanager(
basis_gates=basis_gates,
coupling_map=coupling_map,
synthesis_fidelity=0.99,
pulse_optimize=False,
)
qv64_1 = pm1.run(qv64.decompose())
qv64_2 = pm2.run(qv64.decompose())
edges = [list(edge) for edge in coupling_map.get_edges()]
self.assertTrue(
all(
[qv64_1.qubits.index(qubit) for qubit in instr.qubits] in edges
for instr in qv64_1.get_instructions("cx")
)
)
self.assertEqual(Operator(qv64_1), Operator(qv64_2))
def get_undirected_couplings(coupling_map: CouplingMap):
couplings = coupling_map.get_edges()
for coupling in couplings:
if coupling[0] < coupling[1] and (coupling[1],
coupling[0]) in couplings:
yield coupling