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mthree.utils.expval_and_stddev

expval_and_stddev(items, exp_ops='')[source]

Compute expectation values from distributions.

New in version 0.16.0:
Parameters:
items (list or dict or Counts or ProbDistribution or QuasiDistribution): Input

distributions.

exp_ops (str or dict or list): String or dict representation of diagonal qubit

operators used in computing the expectation value.

Returns:

float : Expectation value. ndarray: Array of expectation values

Notes:

Cannot mix Counts and dicts with M3 Distributions in the same call.

The dict operator format is a sparse diagonal format using bitstrings as the keys.