Circuit and Schedule Assembler
qiskit.assembler
Functions
assemble_circuits
qiskit.assembler.assemble_circuits(circuits, run_config, qobj_id, qobj_header)
Assembles a list of circuits into a qobj that can be run on the backend.
The function qiskit.assembler.assemble_circuits.assemble_circuits() is deprecated as of qiskit 1.2. It will be removed in the 2.0 release. The Qobj class and related functionality are part of the deprecated BackendV1 workflow, and no longer necessary for BackendV2. If a user workflow requires Qobj it likely relies on deprecated functionality and should be updated to use BackendV2.
Parameters
- circuits (List[QuantumCircuit]) – circuit(s) to assemble
- run_config (RunConfig) – configuration of the runtime environment
- qobj_id (int) – identifier for the generated qobj
- qobj_header (QobjHeader) – header to pass to the results
Returns
The qobj to be run on the backends
Return type
Examples
from qiskit.circuit import QuantumRegister, ClassicalRegister, QuantumCircuit
from qiskit.assembler import assemble_circuits
from qiskit.assembler.run_config import RunConfig
# Build a circuit to convert into a Qobj
q = QuantumRegister(2)
c = ClassicalRegister(2)
qc = QuantumCircuit(q, c)
qc.h(q[0])
qc.cx(q[0], q[1])
qc.measure(q, c)
# Assemble a Qobj from the input circuit
qobj = assemble_circuits(circuits=[qc],
qobj_id="custom-id",
qobj_header=[],
run_config=RunConfig(shots=2000, memory=True, init_qubits=True))assemble_schedules
qiskit.assembler.assemble_schedules(schedules, qobj_id, qobj_header, run_config)
Assembles a list of schedules into a qobj that can be run on the backend.
Parameters
- schedules (List[ScheduleBlock |Schedule |Instruction |Tuple[int, Schedule |Instruction]]) – Schedules to assemble.
- qobj_id (int) – Identifier for the generated qobj.
- qobj_header (QobjHeader) – Header to pass to the results.
- run_config (RunConfig) – Configuration of the runtime environment.
Returns
The Qobj to be run on the backends.
Raises
QiskitError – when frequency settings are not supplied.
Return type
Examples
from qiskit import pulse
from qiskit.assembler import assemble_schedules
from qiskit.assembler.run_config import RunConfig
# Construct a Qobj header for the output Qobj
header = {"backend_name": "FakeOpenPulse2Q", "backend_version": "0.0.0"}
# Build a configuration object for the output Qobj
config = RunConfig(shots=1024,
memory=False,
meas_level=1,
meas_return='avg',
memory_slot_size=100,
parametric_pulses=[],
init_qubits=True,
qubit_lo_freq=[4900000000.0, 5000000000.0],
meas_lo_freq=[6500000000.0, 6600000000.0],
schedule_los=[])
# Build a Pulse schedule to assemble into a Qobj
schedule = pulse.Schedule()
schedule += pulse.Play(pulse.Waveform([0.1] * 16, name="test0"),
pulse.DriveChannel(0),
name="test1")
schedule += pulse.Play(pulse.Waveform([0.1] * 16, name="test1"),
pulse.DriveChannel(0),
name="test2")
schedule += pulse.Play(pulse.Waveform([0.5] * 16, name="test0"),
pulse.DriveChannel(0),
name="test1")
# Assemble a Qobj from the schedule.
pulseQobj = assemble_schedules(schedules=[schedule],
qobj_id="custom-id",
qobj_header=header,
run_config=config)disassemble
qiskit.assembler.disassemble(qobj)
Disassemble a qobj and return the circuits or pulse schedules, run_config, and user header.
disassemble(assemble(qc)) is not guaranteed to produce an exactly equal circuit to the input, due to limitations in the QasmQobj format that need to be maintained for backend system compatibility. This is most likely to be the case when using newer features of QuantumCircuit. In most cases, the output should be equivalent, if not quite equal.
The function qiskit.assembler.disassemble.disassemble() is deprecated as of qiskit 1.2. It will be removed in the 2.0 release. The Qobj class and related functionality are part of the deprecated BackendV1 workflow, and no longer necessary for BackendV2. If a user workflow requires Qobj it likely relies on deprecated functionality and should be updated to use BackendV2.
Parameters
qobj (Qobj) – The input qobj object to disassemble
Returns
The disassembled program which consists of:
- programs: A list of quantum circuits or pulse schedules
- run_config: The dict of the run config
- user_qobj_header: The dict of any user headers in the qobj
Return type
Union[CircuitModule, PulseModule]
Examples
from qiskit.circuit import QuantumRegister, ClassicalRegister, QuantumCircuit
from qiskit.compiler.assembler import assemble
from qiskit.assembler.disassemble import disassemble
# Create a circuit to assemble into a qobj
q = QuantumRegister(2)
c = ClassicalRegister(2)
qc = QuantumCircuit(q, c)
qc.h(q[0])
qc.cx(q[0], q[1])
qc.measure(q, c)
# Assemble the circuit into a Qobj
qobj = assemble(qc, shots=2000, memory=True)
# Disassemble the qobj back into a circuit
circuits, run_config_out, headers = disassemble(qobj)Classes
RunConfig([shots, seed_simulator, memory, ...]) | Class for Run Configuration. |