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Update to support Operator.eigvals as a method #35

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merged 4 commits into from
Jun 7, 2022
Merged

Update to support Operator.eigvals as a method #35

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7dce965
eigvals as a method
albi3ro Jun 6, 2022
d986019
Update CHANGELOG.md
albi3ro Jun 6, 2022
11eaf1f
bump version, black
albi3ro Jun 7, 2022
e23e8e9
revert version bumping change
albi3ro Jun 7, 2022
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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -10,10 +10,15 @@

### Bug fixes

* Updates the plugin to be compatible with the use of `Operator.eigvals` as a method.
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[(#35)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/35)

### Contributors

This release contains contributions from (in alphabetical order):

Christina Lee

---

# Release 0.16.0
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5 changes: 4 additions & 1 deletion pennylane_qulacs/qulacs_device.py
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Expand Up @@ -347,7 +347,10 @@ def expval(self, observable, **kwargs):
return qulacs_observable.get_expectation_value(self._pre_rotated_state)

# exact expectation value
eigvals = self._asarray(observable.eigvals, dtype=self.R_DTYPE)
if callable(observable.eigvals):
eigvals = self._asarray(observable.eigvals(), dtype=self.R_DTYPE)
else: # older version of pennylane
eigvals = self._asarray(observable.eigvals, dtype=self.R_DTYPE)
prob = self.probability(wires=observable.wires)
return self._dot(eigvals, prob)

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