qiskit.result.BaseReadoutMitigator.expectation_value¶
- abstract BaseReadoutMitigator.expectation_value(data, diagonal, qubits=None, clbits=None, shots=None)[source]¶
Calculate the expectation value of a diagonal Hermitian operator.
- Parameters
data (
Counts
) – Counts object to be mitigated.diagonal (
Union
[Callable
,dict
,str
,ndarray
]) – the diagonal operator. This may either be specified as a string containing I,Z,0,1 characters, or as a real valued 1D array_like object supplying the full diagonal, or as a dictionary, or as Callable.qubits (
Optional
[Iterable
[int
]]) – the physical qubits measured to obtain the counts clbits. If None these are assumed to be qubits [0, …, N-1] for N-bit counts.clbits (
Optional
[List
[int
]]) – Optional, marginalize counts to just these bits.shots (
Optional
[int
]) – Optional, the total number of shots, if None shots will be calculated as the sum of all counts.
- Return type
Tuple
[float
,float
]- Returns
The mean and an upper bound of the standard deviation of operator expectation value calculated from the current counts.