BackendProperties
class qiskit.providers.models.BackendProperties(backend_name, backend_version, last_update_date, qubits, gates, general, **kwargs)
Bases: object
Class representing backend properties
This holds backend properties measured by the provider. All properties which are provided optionally. These properties may describe qubits, gates, or other general properties of the backend.
Initialize a BackendProperties instance.
The class qiskit.providers.models.backendproperties.BackendProperties is deprecated as of Qiskit 1.2. It will be removed in the 2.0 release. The models in qiskit.providers.models and related objects are part of the deprecated BackendV1 workflow, and no longer necessary for BackendV2. If a user workflow requires these representations it likely relies on deprecated functionality and should be updated to use BackendV2.
Parameters
- backend_name (str) – Backend name.
- backend_version (str) – Backend version in the form X.Y.Z.
- last_update_date (datetime.datetime orstr) – Last date/time that a property was updated. If specified as a
str, it must be in ISO format. - qubits (list) – System qubit parameters as a list of lists of
Nduvobjects - gates (list) – System gate parameters as a list of
GatePropertiesobjects - general (list) – General parameters as a list of
Nduvobjects - kwargs – optional additional fields
Methods
faulty_gates
faulty_qubits
frequency
frequency(qubit)
Return the frequency of the given qubit.
Parameters
qubit (int) – Qubit for which to return frequency of.
Returns
Frequency of the given qubit.
Return type
from_dict
classmethod from_dict(data)
Create a new BackendProperties object from a dictionary.
Parameters
data (dict) – A dictionary representing the BackendProperties to create. It will be in the same format as output by to_dict().
Returns
The BackendProperties from the input dictionary.
Return type
gate_error
gate_error(gate, qubits)
Return gate error estimates from backend properties.
Parameters
- gate (str) – The gate for which to get the error.
- qubits (int |Iterable[int]) – The specific qubits for the gate.
Returns
Gate error of the given gate and qubit(s).
Return type
gate_length
gate_length(gate, qubits)
Return the duration of the gate in units of seconds.
Parameters
- gate (str) – The gate for which to get the duration.
- qubits (int |Iterable[int]) – The specific qubits for the gate.
Returns
Gate length of the given gate and qubit(s).
Return type
gate_property
gate_property(gate, qubits=None, name=None)
Return the property of the given gate.
Parameters
- gate (str) – Name of the gate.
- qubits (int |Iterable[int] | None) – The qubit to find the property for.
- name (str | None) – Optionally used to specify which gate property to return.
Returns
Gate property as a tuple of the value and the time it was measured.
Raises
BackendPropertyError – If the property is not found or name is specified but qubit is not.
Return type
Dict[Tuple[int, …], Dict[str, Tuple[Any, datetime]]] | Dict[str, Tuple[Any, datetime]] | Tuple[Any, datetime]
is_gate_operational
is_gate_operational(gate, qubits=None)
Return the operational status of the given gate.
Parameters
- gate (str) – Name of the gate.
- qubits (int |Iterable[int] | None) – The qubit to find the operational status for.
Returns
Operational status of the given gate. True if the gate is operational, False otherwise.
Return type
is_qubit_operational
is_qubit_operational(qubit)
Return the operational status of the given qubit.
Parameters
qubit (int) – Qubit for which to return operational status of.
Returns
Operational status of the given qubit.
Return type
qubit_property
qubit_property(qubit, name=None)
Return the property of the given qubit.
Parameters
- qubit (int) – The property to look for.
- name (str | None) – Optionally used to specify within the hierarchy which property to return.
Returns
Qubit property as a tuple of the value and the time it was measured.
Raises
BackendPropertyError – If the property is not found.
Return type
readout_error
readout_error(qubit)
Return the readout error of the given qubit.
Parameters
qubit (int) – Qubit for which to return the readout error of.
Returns
Readout error of the given qubit.
Return type
readout_length
readout_length(qubit)
Return the readout length [sec] of the given qubit.
Parameters
qubit (int) – Qubit for which to return the readout length of.
Returns
Readout length of the given qubit.
Return type
t1
t1(qubit)
Return the T1 time of the given qubit.
Parameters
qubit (int) – Qubit for which to return the T1 time of.
Returns
T1 time of the given qubit.
Return type
t2
t2(qubit)
Return the T2 time of the given qubit.
Parameters
qubit (int) – Qubit for which to return the T2 time of.
Returns
T2 time of the given qubit.
Return type
to_dict
to_dict()
Return a dictionary format representation of the BackendProperties.
Returns
The dictionary form of the BackendProperties.
Return type