Result
class Result(backend_name, backend_version, qobj_id, job_id, success, results, date=None, status=None, header=None, **kwargs)
Bases: object
Model for Results.
backend_name
backend name.
Type
str
backend_version
backend version, in the form X.Y.Z.
Type
str
qobj_id
user-generated Qobj id.
Type
str
job_id
unique execution id from the backend.
Type
str
success
True if complete input qobj executed correctly. (Implies each experiment success)
Type
bool
results
corresponding results for array of experiments of the input qobj
Type
list[ExperimentResult]
Methods
data
Result.data(experiment=None)
Get the raw data for an experiment.
Note this data will be a single classical and quantum register and in a format required by the results schema. We recommend that most users use the get_xxx method, and the data will be post-processed for the data type.
Parameters
experiment (str or QuantumCircuit orSchedule or int or None) – the index of the experiment. Several types are accepted for convenience:: * str: the name of the experiment. * QuantumCircuit: the name of the circuit instance will be used. * Schedule: the name of the schedule instance will be used. * int: the position of the experiment. * None: if there is only one experiment, returns it.
Returns
A dictionary of results data for an experiment. The data depends on the backend it ran on and the settings of meas_level, meas_return and memory.
QASM backends return a dictionary of dictionary with the key ‘counts’ and with the counts, with the second dictionary keys containing a string in hex format (0x123) and values equal to the number of times this outcome was measured.
Statevector backends return a dictionary with key ‘statevector’ and values being a list[list[complex components]] list of 2^num_qubits complex amplitudes. Where each complex number is represented as a 2 entry list for each component. For example, a list of [0.5+1j, 0-1j] would be represented as [[0.5, 1], [0, -1]].
Unitary backends return a dictionary with key ‘unitary’ and values being a list[list[list[complex components]]] list of 2^num_qubits x 2^num_qubits complex amplitudes in a two entry list for each component. For example if the amplitude is [[0.5+0j, 0-1j], …] the value returned will be [[[0.5, 0], [0, -1]], …].
The simulator backends also have an optional key ‘snapshots’ which returns a dict of snapshots specified by the simulator backend. The value is of the form dict[slot: dict[str: array]] where the keys are the requested snapshot slots, and the values are a dictionary of the snapshots.
Return type
dict
Raises
QiskitError – if data for the experiment could not be retrieved.
from_dict
classmethod Result.from_dict(data)
Create a new ExperimentResultData object from a dictionary.
Parameters
data (dict) – A dictionary representing the Result to create. It will be in the same format as output by to_dict().
Returns
The Result object from the input dictionary.
Return type
get_counts
Result.get_counts(experiment=None)
Get the histogram data of an experiment.
Parameters
experiment (str or QuantumCircuit orSchedule or int or None) – the index of the experiment, as specified by data([experiment]).
Returns
a dictionary or a list of dictionaries. A dictionary has the counts for each qubit with the keys containing a string in binary format and separated according to the registers in circuit (e.g. 0100 1110). The string is little-endian (cr[0] on the right hand side).
Return type
dict[str, int] or list[dict[str, int]]
Raises
QiskitError – if there are no counts for the experiment.
get_memory
Result.get_memory(experiment=None)
Get the sequence of memory states (readouts) for each shot The data from the experiment is a list of format [‘00000’, ‘01000’, ‘10100’, ‘10100’, ‘11101’, ‘11100’, ‘00101’, …, ‘01010’]
Parameters
experiment (str or QuantumCircuit orSchedule or int or None) – the index of the experiment, as specified by data().
Returns
Either the list of each outcome, formatted according to registers in circuit or a complex numpy np.ndarray with shape:
meas_level meas_return shape 0 single np.ndarray[shots, memory_slots, memory_slot_size] 0 avg np.ndarray[memory_slots, memory_slot_size] 1 single np.ndarray[shots, memory_slots] 1 avg np.ndarray[memory_slots] 2 memory=True list
Return type
List[str] or np.ndarray
Raises
QiskitError – if there is no memory data for the circuit.
get_statevector
Result.get_statevector(experiment=None, decimals=None)
Get the final statevector of an experiment.
Parameters
- experiment (str or QuantumCircuit orSchedule or int or None) – the index of the experiment, as specified by
data(). - decimals (int) – the number of decimals in the statevector. If None, does not round.
Returns
list of 2^num_qubits complex amplitudes.
Return type
list[complex]
Raises
QiskitError – if there is no statevector for the experiment.
get_unitary
Result.get_unitary(experiment=None, decimals=None)
Get the final unitary of an experiment.
Parameters
- experiment (str or QuantumCircuit orSchedule or int or None) – the index of the experiment, as specified by
data(). - decimals (int) – the number of decimals in the unitary. If None, does not round.
Returns
list of 2^num_qubits x 2^num_qubits complex
amplitudes.
Return type
list[list[complex]]
Raises
QiskitError – if there is no unitary for the experiment.
to_dict
Result.to_dict()
Return a dictionary format representation of the Result
Returns
The dictionary form of the Result
Return type
dict