Result
class qiskit.result.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_version
qobj_id
job_id
success
results
Methods
data
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 orQuantumCircuit orSchedule orint 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.
OpenQASM 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
Raises
QiskitError – if data for the experiment could not be retrieved.
from_dict
classmethod 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
get_counts(experiment=None)
Get the histogram data of an experiment.
Parameters
experiment (str orQuantumCircuit orSchedule orint 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
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 orQuantumCircuit orSchedule orint 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
get_statevector(experiment=None, decimals=None)
Get the final statevector of an experiment.
Parameters
- experiment (str orQuantumCircuit orSchedule orint 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
Raises
QiskitError – if there is no statevector for the experiment.
get_unitary
get_unitary(experiment=None, decimals=None)
Get the final unitary of an experiment.
Parameters
- experiment (str orQuantumCircuit orSchedule orint 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
Raises
QiskitError – if there is no unitary for the experiment.
to_dict
to_dict()
Return a dictionary format representation of the Result
Returns
The dictionary form of the Result
Return type