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qiskit.quantum_info.DensityMatrix.expectation_value¶

DensityMatrix.expectation_value(oper, qargs=None)[Quellcode]¶

Compute the expectation value of an operator.

Parameter

oper (Operator) – an operator to evaluate expval.
qargs (None or list) – subsystems to apply the operator on.

Rückgabe

the expectation value.

Rückgabetyp

complex