def compile(qasm_circuit,
basis_gates='u1,u2,u3,cx,id',
coupling_map=None,
initial_layout=None,
silent=True,
get_layout=False,
format='dag'):
"""Compile the circuit.
This builds the internal "to execute" list which is list of quantum
circuits to run on different backends.
Args:
qasm_circuit (str): qasm text to compile
silent (bool): is an option to print out the compiling information
or not
basis_gates (str): a comma seperated string and are the base gates,
which by default are: u1,u2,u3,cx,id
coupling_map (dict): A directed graph of coupling::
{
control(int):
[
target1(int),
target2(int),
, ...
],
...
}
eg. {0: [2], 1: [2], 3: [2]}
initial_layout (dict): A mapping of qubit to qubit::
{
("q", strart(int)): ("q", final(int)),
...
}
eg.
{
("q", 0): ("q", 0),
("q", 1): ("q", 1),
("q", 2): ("q", 2),
("q", 3): ("q", 3)
}
format (str): The target format of the compilation:
{'dag', 'json', 'qasm'}
Returns:
Compiled circuit
"""
compiled_dag_circuit = _unroller_code(qasm_circuit,
basis_gates=basis_gates)
final_layout = None
# if a coupling map is given compile to the map
if coupling_map:
if not silent:
print("pre-mapping properties: %s" %
compiled_dag_circuit.property_summary())
# Insert swap gates
coupling = mapper.Coupling(coupling_map)
if not silent:
print("initial layout: %s" % initial_layout)
compiled_dag_circuit, final_layout = mapper.swap_mapper(
compiled_dag_circuit,
coupling,
initial_layout,
trials=20,
verbose=False)
if not silent:
print("final layout: %s" % final_layout)
# Expand swaps
compiled_dag_circuit = _unroller_code(compiled_dag_circuit.qasm())
# Change cx directions
compiled_dag_circuit = mapper.direction_mapper(compiled_dag_circuit,
coupling)
# Simplify cx gates
mapper.cx_cancellation(compiled_dag_circuit)
# Simplify single qubit gates
compiled_dag_circuit = mapper.optimize_1q_gates(compiled_dag_circuit)
if not silent:
print("post-mapping properties: %s" %
compiled_dag_circuit.property_summary())
# choose output format
if format == 'dag':
compiled_circuit = compiled_dag_circuit
elif format == 'json':
compiled_circuit = dag2json(compiled_dag_circuit)
elif format == 'qasm':
compiled_circuit = compiled_dag_circuit.qasm()
else:
raise QiskitCompilerError('unrecognized circuit format')
if get_layout:
return compiled_circuit, final_layout
else:
return compiled_circuit
def compile(qasm_circuit,
basis_gates='u1,u2,u3,cx,id',
coupling_map=None,
initial_layout=None,
get_layout=False,
format='dag'):
"""Compile the circuit.
This builds the internal "to execute" list which is list of quantum
circuits to run on different backends.
Args:
qasm_circuit (str): qasm text to compile
basis_gates (str): a comma seperated string and are the base gates,
which by default are: u1,u2,u3,cx,id
coupling_map (dict): A directed graph of coupling::
{
control(int):
[
target1(int),
target2(int),
, ...
],
...
}
eg. {0: [2], 1: [2], 3: [2]}
initial_layout (dict): A mapping of qubit to qubit::
{
("q", start(int)): ("q", final(int)),
...
}
eg.
{
("q", 0): ("q", 0),
("q", 1): ("q", 1),
("q", 2): ("q", 2),
("q", 3): ("q", 3)
}
get_layout (bool): flag for returning the layout.
format (str): The target format of the compilation:
{'dag', 'json', 'qasm'}
Returns:
object: If get_layout == False, the compiled circuit in the specified
format. If get_layout == True, a tuple is returned, with the
second element being the layout.
Raises:
QISKitCompilerError: if the format is not valid.
"""
compiled_dag_circuit = _unroller_code(qasm_circuit,
basis_gates=basis_gates)
final_layout = None
# if a coupling map is given compile to the map
if coupling_map:
logger.info("pre-mapping properties: %s",
compiled_dag_circuit.property_summary())
# Insert swap gates
coupling = mapper.Coupling(coupling_map)
logger.info("initial layout: %s", initial_layout)
compiled_dag_circuit, final_layout = mapper.swap_mapper(
compiled_dag_circuit, coupling, initial_layout, trials=20, seed=13)
logger.info("final layout: %s", final_layout)
# Expand swaps
compiled_dag_circuit = _unroller_code(compiled_dag_circuit.qasm())
# Change cx directions
compiled_dag_circuit = mapper.direction_mapper(compiled_dag_circuit,
coupling)
# Simplify cx gates
mapper.cx_cancellation(compiled_dag_circuit)
# Simplify single qubit gates
compiled_dag_circuit = mapper.optimize_1q_gates(compiled_dag_circuit)
logger.info("post-mapping properties: %s",
compiled_dag_circuit.property_summary())
# choose output format
if format == 'dag':
compiled_circuit = compiled_dag_circuit
elif format == 'json':
compiled_circuit = dag2json(compiled_dag_circuit)
elif format == 'qasm':
compiled_circuit = compiled_dag_circuit.qasm()
else:
raise QISKitCompilerError('unrecognized circuit format')
if get_layout:
return compiled_circuit, final_layout
return compiled_circuit