FakeFractionalBackend
class FakeFractionalBackend
A fake 5 qubit backend with dynamic and fractional feature modeled based on FakeLima.
This backend include following features.
- Fractional gates (rx, rzx) in addition to the standard basis gates.
- Control flow operations (if_else, while_loop).
- Pulse calibrations (fractional gates don’t support calibration).
- Gate properties of all instructions.
FakeBackendV2 initializer.
Attributes
backend_name
Default value: 'fake_fractional'
conf_filename
Default value: 'conf_fractional.json'
coupling_map
Return the CouplingMap object
defs_filename
Default value: 'defs_fractional.json'
dirname
Default value: '/home/runner/work/qiskit-ibm-runtime/qiskit-ibm-runtime/qiskit_ibm_runtime/fake_provider/backends/fractional'
dt
Return the system time resolution of input signals
This is required to be implemented if the backend supports Pulse scheduling.
Return type
Optional[float]
Returns
The input signal timestep in seconds. If the backend doesn’t define dt, None will be returned.
dtm
Return the system time resolution of output signals
Return type
float
Returns
The output signal timestep in seconds.
instruction_durations
Return the InstructionDurations object.
instruction_schedule_map
Return the InstructionScheduleMap for the instructions defined in this backend’s target.
instructions
A list of Instruction tuples on the backend of the form (instruction, (qubits)
Return type
List[Tuple[Instruction, Tuple[int]]]
max_circuits
Return type
None
meas_map
Return the grouping of measurements which are multiplexed This is required to be implemented if the backend supports Pulse scheduling.
Return type
List[List[int]]
Returns
The grouping of measurements which are multiplexed
num_qubits
Return the number of qubits the backend has.
Return type
int
operation_names
A list of instruction names that the backend supports.
Return type
List[str]
operations
options
Return the options for the backend
The options of a backend are the dynamic parameters defining how the backend is used. These are used to control the run() method.
props_filename
Default value: 'props_fractional.json'
provider
Return the backend Provider.
Returns
the Provider responsible for the backend.
Return type
Provider
target
version
Default value: 2
name
Name of the backend.
description
Optional human-readable description.
online_date
Date that the backend came online.
backend_version
Version of the backend being provided. This is not the same as BackendV2.version, which is the version of the Backend abstract interface.
Methods
acquire_channel
acquire_channel(qubit)
Return the acquisition channel for the given qubit.
This is required to be implemented if the backend supports Pulse scheduling.
Returns
The Qubit measurement acquisition line.
Return type
AcquireChannel
check_faulty
check_faulty(circuit)
Check if the input circuit uses faulty qubits or edges.
Parameters
circuit (QuantumCircuit) – Circuit to check.
Raises
ValueError – If an instruction operating on a faulty qubit or edge is found.
Return type
None
configuration
configuration()
Return the backend configuration.
Return type
Union[QasmBackendConfiguration, PulseBackendConfiguration]
control_channel
control_channel(qubits)
Return the secondary drive channel for the given qubit
This is typically utilized for controlling multiqubit interactions. This channel is derived from other channels.
This is required to be implemented if the backend supports Pulse scheduling.
Parameters
qubits (Iterable[int]) – Tuple or list of qubits of the form (control_qubit, target_qubit).
Returns
The multi qubit control line.
Return type
List[ControlChannel]
defaults
defaults(refresh=False)
Return the pulse defaults for the backend
Parameters
- refresh (
bool) – IfTrue, re-retrieve the backend defaults from the - file. (local)
Return type
PulseDefaults
Returns
The backend pulse defaults or None if the backend does not support pulse.
drive_channel
drive_channel(qubit)
Return the drive channel for the given qubit.
This is required to be implemented if the backend supports Pulse scheduling.
Returns
The Qubit drive channel
Return type
DriveChannel
measure_channel
measure_channel(qubit)
Return the measure stimulus channel for the given qubit.
This is required to be implemented if the backend supports Pulse scheduling.
Returns
The Qubit measurement stimulus line
Return type
MeasureChannel
properties
properties(refresh=False)
Return the backend properties
Parameters
- refresh (
bool) – IfTrue, re-retrieve the backend properties - file. (from the local)
Return type
BackendProperties
Returns
The backend properties.
qubit_properties
qubit_properties(qubit)
Return QubitProperties for a given qubit.
If there are no defined or the backend doesn’t support querying these details this method does not need to be implemented.
Parameters
qubit (Union[int, List[int]]) – The qubit to get the QubitProperties object for. This can be a single integer for 1 qubit or a list of qubits and a list of QubitProperties objects will be returned in the same order
Return type
Union[QubitProperties, List[QubitProperties]]
Returns
The QubitProperties object for the specified qubit. If a list of qubits is provided a list will be returned. If properties are missing for a qubit this can be None.
Raises
NotImplementedError – if the backend doesn’t support querying the qubit properties
refresh
refresh(service)
Update the data files from its real counterpart
This method pulls the latest backend data files from their real counterpart and overwrites the corresponding files in the local installation: * ../fake_provider/backends/{backend_name}/conf_{backend_name}.json * ../fake_provider/backends/{backend_name}/defs_{backend_name}.json * ../fake_provider/backends/{backend_name}/props_{backend_name}.json
The new data files will persist through sessions so the files will stay updated unless they
are manually reverted locally or when qiskit-ibm-runtime is upgraded/reinstalled.
Parameters
service (QiskitRuntimeService) – A QiskitRuntimeService instance
Raises
- ValueError – if the provided service is a non-QiskitRuntimeService instance.
- Exception – If the real target doesn’t exist or can’t be accessed
Return type
None
run
run(run_input, **options)
Run on the fake backend using a simulator.
This method runs circuit jobs (an individual or a list of QuantumCircuit ) and pulse jobs (an individual or a list of Schedule or ScheduleBlock) using BasicSimulator or Aer simulator and returns a Job object.
If qiskit-aer is installed, jobs will be run using AerSimulator with noise model of the fake backend. Otherwise, jobs will be run using BasicSimulator without noise.
Currently noisy simulation of a pulse job is not supported yet in FakeBackendV2.
Parameters
- run_input (QuantumCircuit or Schedule or ScheduleBlock or list) – An individual or a list of
QuantumCircuit,ScheduleBlock, orScheduleobjects to run on the backend. - options – Any kwarg options to pass to the backend for running the config. If a key is also present in the options attribute/object then the expectation is that the value specified will be used instead of what’s set in the options object.
Returns
The job object for the run
Return type
Job
Raises
QiskitError – If a pulse job is supplied and qiskit-aer is not installed.
set_options
set_options(**fields)
Set the options fields for the backend
This method is used to update the options of a backend. If you need to change any of the options prior to running just pass in the kwarg with the new value for the options.
Parameters
fields – The fields to update the options
Raises
AttributeError – If the field passed in is not part of the options