Get the histogram data of an experiment.
- int] or list[dict[str:int]]: 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 on the right hand side).
- Return type
QiskitError – if there are no counts for the experiment.