BackendV2¶
- class BackendV2(provider=None, name=None, description=None, online_date=None, backend_version=None, **fields)[source]¶
Bases:
qiskit.providers.backend.Backend
,abc.ABC
Abstract class for Backends
This abstract class is to be used for all Backend objects created by a provider. This version differs from earlier abstract Backend classes in that the configuration attribute no longer exists. Instead, attributes exposing equivalent required immutable properties of the backend device are added. For example
backend.configuration().n_qubits
is accessible frombackend.num_qubits
now.The
options
attribute of the backend is used to contain the dynamic user configurable options of the backend. It should be used more for runtime options that configure how the backend is used. For example, something like ashots
field for a backend that runs experiments which would contain an int for how many shots to execute.If migrating a provider from
BackendV1
orBaseBackend
one thing to keep in mind is for backwards compatibility you might need to add a configuration method that will build aBackendConfiguration
object andBackendProperties
from the attributes defined in this class for backwards compatibility.Initialize a BackendV2 based backend
- Parameters
provider (
Optional
[Provider
]) – An optional backwards reference to theProvider
object that the backend is fromname (
Optional
[str
]) – An optional name for the backenddescription (
Optional
[str
]) – An optional description of the backendonline_date (
Optional
[datetime
]) – An optional datetime the backend was brought onlinebackend_version (
Optional
[str
]) – An optional backend version string. This differs from theversion
attribute asversion
is for the abstractBackend
abstract interface version of the object whilebackend_version
is for versioning the backend itself.fields – kwargs for the values to use to override the default options.
- Raises
AttributeError – If a field is specified that’s outside the backend’s options
Methods
Return the acquisition channel for the given qubit.
Return the secondary drive channel for the given qubit
Return the drive channel for the given qubit.
Return the measure stimulus channel for the given qubit.
Return QubitProperties for a given qubit.
Run on the backend.
Set the options fields for the backend
Attributes
- coupling_map¶
Return the
CouplingMap
object
- dt¶
Return the system time resolution of input signals
This is required to be implemented if the backend supports Pulse scheduling.
- Returns
The input signal timestep in seconds. If the backend doesn’t define
dt
None
will be returned- Return type
dt
- dtm¶
Return the system time resolution of output signals
- Returns
The output signal timestep in seconds.
- Return type
dtm
- Raises
NotImplementedError – if the backend doesn’t support querying the output signal timestep
- 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¶
The maximum number of circuits (or Pulse schedules) that can be run in a single job.
If there is no limit this will return None
- meas_map¶
Return the grouping of measurements which are multiplexed
This is required to be implemented if the backend supports Pulse scheduling.
- Returns
The grouping of measurements which are multiplexed
- Return type
meas_map
- Raises
NotImplementedError – if the backend doesn’t support querying the measurement mapping
- 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¶
A list of
Instruction
instances that the backend supports.- Return type
List
[Instruction
]
- 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.
- provider¶
Return the backend Provider.
- Returns
the Provider responsible for the backend.
- Return type
- target¶
A
qiskit.transpiler.Target
object for the backend.- Return type
- version = 2¶