Fix the calculation for identity operator's expectation value (backport #13345) #13436
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* Fix the calculation for identity operator's expectation value * Add release note and test * reformatted `test_statevector.py` with black * Update releasenotes/notes/fix_identity_operator_9e2ec9770ac046a6.yaml Co-authored-by: Julien Gacon <[email protected]> * add a docstring to pass the pylint test * Fix leading `.` --------- Co-authored-by: Julien Gacon <[email protected]> (cherry picked from commit edad499)
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Changelog: Bugfix
Pull Request Test Coverage Report for Build 11828146073Details
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Cryoris
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Nov 14, 2024
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Summary
Fix a bug in
qiskit.quantum_infoin the calculation of expectation value of the identity operator.Fixes #13029
Details and comments
Currently,
qiskit.quantum_infoyields incorrect results for the expectation value of an identity operator for a given state vector. It returns the norm of the state vector; however, it ought to return the square of the norm.Therefore, I am changing the following line
qiskit/qiskit/quantum_info/states/statevector.py
Lines 478 to 479 in 1be2c5a
to
This is an automatic backport of pull request #13345 done by [Mergify](https://mergify.com).