qiskit.providers.models.BackendProperties

class BackendProperties(backend_name, backend_version, last_update_date, qubits, gates, general, **kwargs)

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 propeties of the backend.

Initialize a BackendProperties instance.

Parameter

• backend_name (str) – Backend name.

• backend_version (str) – Backend version in the form X.Y.Z.

• last_update_date (datetime or str) – 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 Nduv objects

• gates (list) – System gate parameters as a list of Gate objects

• general (list) – General parameters as a list of Nduv objects

• kwargs – optional additional fields

__init__(backend_name, backend_version, last_update_date, qubits, gates, general, **kwargs)

Initialize a BackendProperties instance.

Parameter

• backend_name (str) – Backend name.

• backend_version (str) – Backend version in the form X.Y.Z.

• last_update_date (datetime or str) – 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 Nduv objects

• gates (list) – System gate parameters as a list of Gate objects

• general (list) – General parameters as a list of Nduv objects

• kwargs – optional additional fields

Methods

__init__(backend_name, backend_version, …)	Initialize a BackendProperties instance.
faulty_gates()	Return a list of faulty gates.
faulty_qubits()	Return a list of faulty qubits.
frequency(qubit)	Return the frequency of the given qubit.
from_dict(data)	Create a new Gate object from a dictionary.
gate_error(gate, qubits)	Return gate error estimates from backend properties.
gate_length(gate, qubits)	Return the duration of the gate in units of seconds.
gate_property(gate[, qubits, name])	Return the property of the given gate.
is_gate_operational(gate[, qubits])	Return the operational status of the given gate.
is_qubit_operational(qubit)	Return the operational status of the given qubit.
qubit_property(qubit[, name])	Return the property of the given qubit.
readout_error(qubit)	Return the readout error of the given qubit.
t1(qubit)	Return the T1 time of the given qubit.
t2(qubit)	Return the T2 time of the given qubit.
to_dict()	Return a dictionary format representation of the BackendProperties.

faulty_gates()

Return a list of faulty gates.

faulty_qubits()

Return a list of faulty qubits.

frequency(qubit)

Return the frequency of the given qubit.

Parameter

qubit (int) – Qubit for which to return frequency of.

Rückgabetyp

float

Rückgabe

Frequency of the given qubit.

classmethod from_dict(data)

Create a new Gate object from a dictionary.

Parameter

data (dict) – A dictionary representing the Gate to create. It will be in the same format as output by to_dict().

Rückgabe

The BackendProperties from the input

dictionary.

Rückgabetyp

BackendProperties

gate_error(gate, qubits)

Return gate error estimates from backend properties.

Parameter

• gate (str) – The gate for which to get the error.

• qubits (Union[int, Iterable[int]]) – The specific qubits for the gate.

Rückgabetyp

float

Rückgabe

Gate error of the given gate and qubit(s).

gate_length(gate, qubits)

Return the duration of the gate in units of seconds.

Parameter

• gate (str) – The gate for which to get the duration.

• qubits (Union[int, Iterable[int]]) – The specific qubits for the gate.

Rückgabetyp

float

Rückgabe

Gate length of the given gate and qubit(s).

gate_property(gate, qubits=None, name=None)

Return the property of the given gate.

Parameter

• gate (str) – Name of the gate.

• qubits (Union[int, Iterable[int], None]) – The qubit to find the property for.

• name (Optional[str]) – Optionally used to specify which gate property to return.

Rückgabetyp

Tuple[Any, datetime]

Rückgabe

Gate property as a tuple of the value and the time it was measured.

Verursacht

BackendPropertyError – If the property is not found or name is specified but qubit is not.

is_gate_operational(gate, qubits=None)

Return the operational status of the given gate.

Parameter

• gate (str) – Name of the gate.

• qubits (Union[int, Iterable[int], None]) – The qubit to find the operational status for.

Rückgabe

Operational status of the given gate. True if the gate is operational, False otherwise.

Rückgabetyp

bool

is_qubit_operational(qubit)

Return the operational status of the given qubit.

Parameter

qubit (int) – Qubit for which to return operational status of.

Rückgabetyp

bool

Rückgabe

Operational status of the given qubit.

qubit_property(qubit, name=None)

Return the property of the given qubit.

Parameter

• qubit (int) – The property to look for.

• name (Optional[str]) – Optionally used to specify within the hierarchy which property to return.

Rückgabetyp

Tuple[Any, datetime]

Rückgabe

Qubit property as a tuple of the value and the time it was measured.

Verursacht

BackendPropertyError – If the property is not found.

readout_error(qubit)

Return the readout error of the given qubit.

Parameter

qubit (int) – Qubit for which to return the readout error of.

Rückgabetyp

float

Rückgabe

Readout error of the given qubit,

t1(qubit)

Return the T1 time of the given qubit.

Parameter

qubit (int) – Qubit for which to return the T1 time of.

Rückgabetyp

float

Rückgabe

T1 time of the given qubit.

t2(qubit)

Return the T2 time of the given qubit.

Parameter

qubit (int) – Qubit for which to return the T2 time of.

Rückgabetyp

float

Rückgabe

T2 time of the given qubit.

to_dict()

Return a dictionary format representation of the BackendProperties.

Rückgabe

The dictionary form of the BackendProperties.

Rückgabetyp

dict